Gymnastics, surfing, and study and write philosophical works. And maybe practice guitar.

I would be what I am now, just a more "official" version of it, since what I do is akin to a paid hobby and has no firmly nested societal position. But that's assuming what I do would be valued in other types of societies either (it's just barely valued in Capitalism). I know a Marxist society most likely wouldn't value what I do as it's only a necessity-based job on a technical level. And it would have little relevance in Distributism, I think. Mutualism is a coin toss.

I'd be writing a lot more music

I would offer people money to work for me.
And then i would help them optimize their brainspace to be more efficient at helping me.
I would allow them to use my workshop to create things that benefit the community. Like tools and Labor.
I would keep watch over the water and electrical lines and repair and service them if needed.
I would train people to do that for me and pay them.

I'd probably still be a mechanical engineer, but maybe I could have gotten some more education in the direction of nuclear power and/or automation. I might have also had another kid instead of just one.

Edit: I'd also like to learn and get good at welding. It would be cool to not only engineer a nuclear power plant, but to help actually build it as well. Then again, I'd probably never get good enough at welding to do so unless I devoted myself to the trade. Maybe I could just get some shifts as a plant operator after it's built.

Probably sleep or do gamedev in a full time fashion.

I would love to do more with animation especially non-traditional animation like LED or Pinscreen, but the barrier of entry is just too high.

Rock climbing. I got into over summer but I only have time to go once or twice a week at most. And that's just indoors. A whole outdoor trip would take way too much of my time, time that I don't have.

I think about this at least a little bit most days.

I'd finish some video games again.

Work on more music, ideally practice piani again to get my theory back on track.

Make projects, communal gardening etc..

Outside the selfish self-enrichment kinda stuff, teach kids programming, and participate more in my hema club.

Same thing I do now, but instead of full-time work / part-time student, I'd flip it to part-time work and full-time student.

I'm hanging on to the bottom step of the medical ladder - this field is fascinating as fuck, and even as just a tech I get a lot of satisfaction in my role (albeit minor relative to doctors or nurses) in helping others recover from whatever sickness/injury they present with.

Without the financial barriers and current need to work till exhaustion to afford rent, I'd be highly interested in going all the way to physician, but at the rate I'm able to actually afford the time and money to take classes, I'll be pushing 40 when I'm able to clear the hurdle from tech to nurse; and it already hurts to move half of my fucking joints, so once this nursing shit is finished, I don't see myself climbing any more ladders, literal or otherwise... at that point it'll just be the counting the days till retirement or planning out the most pleasurable way to commit suicide.

I would write and draw more. There's so many stories I wanna make. I might even take up some other medium like animation or something physical like sculpture or architecture. It would be fun to design spaces that don't need to have the soul sucked out of them to appear "mature" or "professional"

I feel like the fear of not making profits and not surviving pressures me into watering down everything I do so it's appealing to someone else. That's why art is strictly a hobby for me and not a career I wanna pursue

Something new every day. Create. Spend time with my children. Volunteer my time and knowledge.