The past is fixed. You can’t change it, so move on.
That’s what I often used to hear.
The only thing is that our past has shaped our worldview, which might not be terribly helpful right now. (present)
What if I could go back to my past and experience events with a different worldview?
Imagine and revisit those experiences with your current worldview (hopefully wiser self).
Can you see those particular events with a different perspective?