5 Side Hustles I Actually Tried — The Honest Results After 90 Days
By Adrian Martinez
Most articles about side hustles are written by people who either never tried them or cherry-picked their best month and turned it into a headline. I'm 18, I've been obsessing over real estate and online business for the last two years, and I spent 90 days running five different income experiments simultaneously — tracking every dollar, every hour, and every moment I wanted to quit. Some of these surprised me. One of them genuinely changed how I think about building income. And one was a complete waste of three weeks that I'll never get back. Here's the unfiltered breakdown.
Why I Did This (And Why You Should Care)
I got tired of the vague success stories. "I made $10k in my first month flipping websites!" Cool. What did you do on day one? What did you spend? What happened when it didn't work?
So I set a simple framework: 90 days, real effort, honest tracking. I logged hours in Notion, tracked revenue in a spreadsheet, and gave each hustle a genuine shot before drawing conclusions. My goal wasn't to go viral or write a feel-good thread — it was to figure out which income streams actually made sense for someone my age with limited capital but serious time and energy to invest.
I started with roughly $300 in seed money, a laptop, and a willingness to look stupid while learning. Here's what happened.
Hustle #1: Flipping Items on Facebook Marketplace
Time invested: ~8 hours/week
Revenue (90 days): $1,240
Profit after costs: $610
Verdict: Real money, real ceiling
I started small — used textbooks, a broken PS4 I bought for $40 and fixed with a $12 YouTube tutorial, random electronics from garage sales. The first two weeks I made $180 in profit and felt like a genius. Then I hit the wall.
The problem with flipping isn't finding buyers. It's sourcing. By week five, I was driving 25 minutes to pick up a lamp that netted me $15 after gas. The time-to-money ratio started collapsing. I was essentially working a $9/hour job with extra logistics.
The lesson here isn't that flipping is bad. It's that flipping doesn't scale without systems — a dedicated sourcing route, storage space, and eventually a team. As a solo 18-year-old with no storage unit, I hit the ceiling fast. Still, $610 pure profit in 90 days isn't nothing. It funded my next experiment.
Hustle #2: Freelance Content Writing
Time invested: ~10 hours/week
Revenue (90 days): $1,875
Profit after costs: $1,850 (near zero overhead)
Verdict: Best ROI for pure beginners
I pitched 40 businesses in week one via cold email. Three responded. One paid me $75 for a blog post. That felt slow, but here's what the hustle gurus don't tell you — the second month is nothing like the first.
By day 45, I had two recurring clients. By day 75, I had four. I was writing about real estate investing, AI tools, and marketing — topics I already lived in. My rate went from $75/post to $150/post because I stopped pitching on price and started pitching on specific results (traffic data, conversion copy, industry knowledge).
$1,875 in 90 days from writing. That's not life-changing money yet, but the trajectory was undeniable. It compounds. Retainer clients mean predictable income, and predictable income means you can make strategic moves instead of desperate ones.
The real unlock was niching down. "I write content" gets you ignored. "I write SEO-focused content for real estate investors and proptech companies" gets you hired.
Hustle #3: Selling Digital Products (Notion Templates)
Time invested: ~5 hours upfront, ~1 hour/week ongoing
Revenue (90 days): $290
Profit: $290
Verdict: Slow build, but genuinely passive
I built three Notion templates — a real estate deal analyzer, a side hustle tracker (meta, I know), and a content calendar for creators. Listed them on Gumroad for $9–$19 each.
The honest truth? Month one was brutal. $23. I almost pulled them down.
Then I posted the deal analyzer in two real estate Facebook groups with a genuine explanation of how I use it. $140 in 48 hours. The product didn't change — the distribution changed. This is the lesson every digital product creator learns too late: building is 20% of the job. Distributing is 80%.
$290 over 90 days sounds weak until you realize I spent 5 hours making these and they'll keep selling indefinitely. The ceiling on this one is purely a function of how many eyeballs I can get to the right landing page.
Hustle #4: Real Estate Wholesale Outreach
Time invested: ~12 hours/week
Revenue (90 days): $0 closed, one deal under contract
Profit: Not yet realized
Verdict: Highest upside, longest runway
Okay, this is where it gets real. Wholesaling real estate — finding distressed properties, getting them under contract, and assigning that contract to a cash buyer for a fee — is not a 90-day hustle. It's a business.
I made 200+ cold calls. I sent 150 direct mail pieces. I had 12 motivated seller conversations. One property in my target area is currently under contract, and if it closes, the assignment fee will be between $8,000–$12,000.
The reason I'm including this is simple: most people quit wholesaling in month two because there's no paycheck. I almost did. What kept me going was tracking leading indicators — calls made, conversations had, offers submitted — not just revenue. The revenue is lagging. The activity is what you control.
Real estate rewards patience in a way that almost no other hustle does. One deal can outperform every other item on this list combined. That changes your relationship with the timeline.
Hustle #5: AI Automation Services for Small Businesses
Time invested: ~6 hours/week
Revenue (90 days): $2,100
Profit: $2,050
Verdict: The most scalable thing I've ever touched
This one genuinely changed my thinking. I started offering basic AI automation setups to local small businesses — think automated follow-up emails, AI-assisted customer service workflows, lead capture systems. Tools like Make.com, Zapier, and various AI APIs handle the heavy lifting. I learned them in about three weeks of focused study.
My first client was a real estate agent who was manually following up with every lead by hand. I built her a simple automated sequence that triaged leads and sent personalized follow-ups based on their behavior. Charged her $700 for setup and $150/month for maintenance.
Client two was a local service business. Same story, different workflow. $600 setup, $100/month.
The magic of automation services is the recurring revenue model. You're not selling a one-time thing — you're selling ongoing leverage. Businesses don't cancel systems that are actively making them money. And as AI tools get more powerful, the value you can deliver keeps increasing while the technical complexity keeps decreasing.
This is the space I'm going deepest on in 2025.
The Real Takeaways After 90 Days
Here's what the numbers actually taught me:
Total revenue across all 5 hustles: $5,505
Total profit: ~$4,800
Total hours: roughly 32 hours/week average
That's about $16.50/hour in pure profit — but that's the average, and averages lie. The writing and automation work paid $30–$40/hour effectively. The flipping paid closer to $9. The digital products paid nothing upfront and will pay forever on autopilot.
The lesson isn't "do all five of these." The lesson is run the experiments fast, read the data honestly, and then go deep on what's working. Most people never start because they're waiting for certainty. Certainty only comes from action.
I'm 18. I don't have certainty. I have a Notion dashboard, a spreadsheet, and a bias toward movement.
If you want to see the tools, templates, and automation systems I'm actually using to build these income streams, I break everything down at automateflowai-adrian.netlify.app — real resources, no fluff.
Drop your questions in the comments. I read every one.
Adrian Martinez is an entrepreneur focused on real estate, AI automation, and building passive income. Follow on Dev.to for weekly insights.
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