Once you’ve conquered Maslow’s original hierarchy of needs, dig into his final need that he added later in life. Achieve not for yourself but for your community or your world. Transcend the self, and feel that higher order need. As another commenter mentioned, altruistic endeavors are a good choice. Even things like being a Boy Scout leader can be hugely fulfilling of that broader need.
Where do I start? What's the first baby step? I googled "Volunteering opportunities" many times without success so far ;)
Good luck! I feel you will hit upon something worth while.