When my kids were young,, I told them that everyone should have hobbies. And you should try to make a living pursuing your favorite one.
Worked for me (I'm on my fourth retirement; works for my daughter (who's a self-employed landscape gardner) and my son(who rents, maintains and manages a stable of sports racing cars.)

Maybe it's luck, but I think a lot of it consists of deciding what you really want to spend your time doing.