The evolution of getting good at something is what brings about career happiness, not just picking something you’re passionate about.
— Cal Newport

When we go and see a movie, we’re banking on the fact that the story will have a strong arc. All the great ones do. The protagonist starts "here" and ends up "there" All that's in between grips and holds us.  

Yes, we want strong arcs in our movies; and, yes—we want them in our real lives too. The journey to proficiency, excellence, and mastery in any field makes for a strong, and satisfying arc. Get one going in your life.