I’m old and I like my life well enough to not want to fuck with changing things. But your rule about merging memories - I’d absolutely love to go back to any holiday in my childhood when I could see my dad, cousin, and grandma one more time. I could come back with fresh memories of them all healthy and happy. I’d sell my soul for that.
This is how I found out a couple of my old acquaintances had passed. I searched them up and found their death notices.
On the other hand, I have a friend with whom I made a pact to notify our respective families if we start to go down because we care but are not in regular contact.
Actually I really like the idea that I will die and join the legions of humans who lived interesting lives and disappeared in the sands of time.