Success is a force you must learn to control, like a superpower. When you do something well, it shows, no matter what. And when you do that thing well, people keep wanting you to do it. If they want it badly enough, and you feel like making a profit, you can charge them money for it. Then you're set for life.
You can branch off from the initial success (say, teaching) and write books about it, create websites around it, become a mentor to others who are pursuing it. The sky's the limit, really. But what if that thing you're so good at isn't really what you want to do?
If you become famous or wealthy enough doing that first thing, you've gotten yourself a wonderful platform and hefty bank account to support anything else you want to do. It helps your admirers if that new thing ties into what you became so famous for, but the two don't have to be associated.
What would you do if you became successful in something you hadn't intended to pursue? Would you keep doing it just to make money, or would you follow another path?
Here's another question. If what you wanted to do most was a struggle, and your successes came from something you didn't have to try for, which would you choose?