I'd like to blame it on being young and dumb but the worst 'decision' I made was to stop actively trying to progress myself once I finished university. I found a job as a junior dev which I grew to enjoy but was using a proprietry scripting language which I didn't realise the tremendous downside of until I had been there stagnating for 6 or so years. 'Thankfully' I got made redundant after nearly 10 years which lit a fire to actually improve myself albeit 8 years or so later than I should. So being lazy was definitely the worst decision I have made.
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