Need your feedback about: Which marketing channel did you focus on building Website traffic?

Last week we release a new version of ManualsRepo.com. Our product is launched about 1 year ago, but it's not growing. What is a marketing channel we can focus on? (Medium, Social Media or SEO, ProductHunt...)

What ManualsRepo does:

1. Collect a ton of manuals (user guide, documents, installation guide) and organize them.
2. Extract data from PDF files and make it easy for users to find information.
3. Help users download document manuals fastest and more accurately.

I'll appreciate your feedback, thank you so much.

Website: https://manualsrepo.com
Console Command Manuals: https://manualsrepo.com/command