What's the One Thing I Can Do?

Gotyo: What's the one thing i can do such that by doing it, everything else will be easier or unnecessary? Gotyo: The metaphor for the book is a domino run. We want many things to happen but if you line them up correctly and do the first correct action, you can create these chain reactions in your life. And the question is designed to find the longest domino run currently available in world.