The 2nd law of thermodynamics tells us that the energy that animates us is never created or destroyed, only changes form.

So after death, the people who love you are sad and reminded of their own mortality, but Heaven and reincarnation are probably fairy tales the ego loves to perpetuate in its undying mission for self preservation.

To me, this suggests that after death, all personal memory is completely wiped and a reconstitution of spirit energy produces a new combination of energy that has never existed before and never will again.

YOLO, but tempered with awareness of foundational oneness of all things.