I remember reading an essay comparing one's personality to a polyhedral die, which rolls somewhat during our childhood and adolescence, and then mostly settles, but which can be re-rolled in some cases by using psychedelics. I don't have any direct experience with that, and definitely am not in a position to give advice, but just wondering whether we have a potential for plasticity that should be researched further, and that possibly AI can help us gain insights into how things might be.

Isn't that the point of being alive?

The human brain is mutable, the human "soul" is a concept thats not proven yet and likely isn't real.