The destination isn't the end of the _journey. In fact, the destination is where real life begins. Where new experiences and the real work take place.
The journey up until now has simply been preparing you and pushing you to realize the destination was just a stepping stone to another great achievement. Because without the motivation for more, we'd find ourselves to be disappointed with ourselves.
Fulfilling ones perceived purpose is merely an open door to the cause you didn't realize you were meant for. The one that truly shows you the possibility of what you can accomplish by simply having the courage to seek it.