How Do You Decide What's Enough?

I feel like right now we live in this world of infinite opportunity, when do you get to the point where you're like, okay, well, this is enough? I was lucky. My first book came out and was a bestseller like at 25. Of course, you still have to care if you're totally indifferent to what anyone says or thinks about it. But I've tried to get to a place where the success is the thing and then the other stuff is bonus. That's incredibly challenging, I think.