Since you're already doing maintenance on rentals, I'd continue to fix/flip houses for myself rather than do hourly work for others. If you pick your projects wisely, the pay is a lot better. If you have a passion for a specific trade, then of course do it for enjoyment.
I'm roughly following my own advice. I'm an electronics engineer, retiring next year, and I plan on doing more extensive car builds, as that is my passion/hobby. I have also done fixer/live-in/slow flip houses and will probably do more of that, although it may be focused on places for my daughters rather than myself, to help them build wealth. I enjoy all of the trades work when I'm doing it for myself, but I think having customers (and their attendant attitudes and issues) would suck the fun right out of it..