One of the reasons you don’t grow, is because the nature of time is that it goes one way. Forward. It doesn’t stop, it doesn’t go backwards, and mistakes are mistakes made.
But we, humans, are equipped with a brain that is able to model, replay, and practice, to turn mistakes into learning. Through repetition, or through thought experiments. But either way: being awake… And that is the first thing that’s missing… being awake.