People are happiest when they're growing. Stagnation at any level leads to complacency. No matter where you are in your endeavors, focus on growth.
You hear about people who "have heart." They perform with bravato and inspire others with their passion. This is the inner fire that propels people to greatness.
Ultimately, it's not about you. It's about your contribution to making the world a better place. The best performers escape their egos and commit to a larger purpose.