How do people at the top stay at the top? Mentoring.
The most successful businesspeople, athletes, actors--anyone who performs at a high level of skill--typically has someone who offers training, counseling, or accountability to help keep those skills sharp. Along the way, you may become a mentor to someone else in your chosen field. The master-protege relationship has worked for centuries.
Think of it this way...you take a beginner's karate class. Your sensei is probably in training himself, taking master classes from the sensei/owner, a 3rd-degree black belt. And after the classes are finished at his dojo, the 3rd-degree meets with his sensei, an 8th-degree black belt, to attain the very highest levels of martial arts proficiency.
Do you have a mentor? When it comes to career advancement and personal growth, nothing compares to the advice, guidance and counseling gained at the feet of a more experienced person willing to show you the ropes.