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I'm not going to speak for everyone since I just started making money with art, but what's working for me is hunting down commissions. I literally just googled art commission subreddits, sorted all of them by new, looked for those with the tag "[Hiring]" and comment/PM'd some of them over a few days sending them my portfolio. If you're good, you should hear back from at least one of them without issue, I only tried with maybe 10 threads at most and got 3 people to reply (unfortunately one of them pulled out before we started but whatever). You can also make a "[For Hire]" thread for that extra possibility of someone actually PMing you.
If you want something more stable (HA!) maybe try building up a portfolio focused on the one thing you want to do. Idfk I'm just an anon who made $200 by browsing fucking reddit.
