Although I love Naval's ideas, I don't think there is a singular model to accountability and skin in the game.
It is to compete with yourself every day given the constraints you have as an individual.
As an example, I would rather find the best happy me than copying a so-called successful person.
To me, owning a business is the ultimate experience for people skills which you can never learn in a classroom. But I would rather do it on my own individual terms than copying a mental model.