From zen habits: It’s really that simple. Narrow down what you do, and do it repeatedly. Learn, grow, improve, read, watch, do it some more. When you’re really good at that one thing, people will want to pay you for it, or to learn how you do it.
It takes a lot of focus and practice to get good at doing one thing, but I’ve found that if you truly love it, it’s not really work. It’s play. And I never complain about playing at something I love.