A few years back I was working full-time (on prem) and wanted to make some extra income, so I decided to try Toptal. It took me a few tries to get in, but shortly after joining I landed a 5hr/week gig at a decent starting rate! Woohoo! I was able to use this extra money to relocate, go fully remote, and also get better part-time gigs through Toptal.

There's gigs from 5-10 hrs/week, but also 20-30 hrs/week jobs. That's honestly kind of the sweet spot, because you could theoretically just get paid better to work less hours...