Game developer. It's a highly-competitive field riddled with crunch culture, lowballed salaries, and employment-instability, but if it weren't for all of that I think it would be the most fulfilling thing I could be doing.
That's precisely the reason why the conditions are terrible. Lots of people would love to work in it.
Computer games is software art which has most chance to survive in ever obsolete tech race. You can proudly show your works to your kids and grandkids and they may have fun from it. Next and somehow related are emulators of old hardware/OSes.