A solid fundamental analysis and periodic trading is all it takes to supplement an income while working full time, guess it counts as some sort of a proof of concept. You and you alone are responsible for your cryptoassets.
Do you know what pains the most when you're trading and working? That a single day of bull market can bring you bigger profits than a month of working your ass off and a single bad trade can cost you your whole monthly or even yearly salary. When I think about it it sickens me and makes me want to trade full time and not have to go to work.