Think of yourself as an eternal student to stay humble.
Think of yourself like many of the ancient Stoics did: An eternal student of life, dedicated to learning as long as you live. This keeps you humble and encourages you to learn from the best in your field.
However, it pays to look both up and down the chain: take some time to mentor and teach others. Going back to beginners and helping them exposes you to the full spectrum of skill levels and is another way to restrain your ego.