Indie games. They never make any money and I'd have to learn to program, but experimental interactive narratives using video game engines is something I am extremely interested in... and I'd do it if I had any time! But this kid's gotta put steak on the plate.
Also, fan fictions. I haven't been able to make the Glory of Bowsette sequel that people have been clamoring for since 2018, and there are some bigger projects that I'd love to do while playing in someone else's franchise. But I'm already too busy for my own projects, so those get put on the "maybe when you're writing full-time as your sole job" back burner.