According to your understanding, one can't forget the past, the formation of the present depends on the past, the experience can't disappear, and the thinking can't change completely.

If you want to create something, think about the present, just like the opportunity cost. The future depends on the present, which means that the present also depends on the past, but the past is still the past. If you want to create the future, you should consider the present and take action as soon as possible.