What do you love to do? What are you frustrated about not existing.
Find either a gap in the market you can fill, or something you're talented at.
I can't answer what that is, it's different for each person.
I chose storytelling because I have the "pied piper" effect on DCs, I start telling a story, and DCs flock to me.
I can spin a story from a few random words, and have people in tears of sorrow or joy, as I choose.
Not many people can do that, so I'm ahead of the game.
I also make bespoke short stories, nobody does that properly, that's my gap in the market.
The hours are longer than I ever did as an employee, but I love my work so am more than happy to put the time in.