I agree with other posters. Take a course in theory. However, you might find the course(s) really boring if you can already play your fingers off. When taking the course, make sure to stay humble. There may be some people in the class who will be able to school in theory yet be nowhere near your facility level on the keys. What you naturally have probably cannot be taught, but don't throw that in other folks' faces. After all, you can't take credit for the gift because it's God gift to you; he created it and can take it away. So, just lay back in the cut while in class. Soak up as much knowledge as you can. Give props to the great ones of the past. Then, come back and teach the rest of the world your contributions to music.