“You cannot realize ANYTHING once you die.”
There is only one way you can prove this is proof.
I do not remember a thing before I was born.
I did not exist then. When things die they cease to exist.
You want to know what happens after death? Go look at some dead things. They decompose and it’s the carbon cycle.
It is impossible to know anything before existence and after existence. WHY? because you must be self aware and traveling through time forward as we experience everything as past, even the now. Science has proven that even light hitting your eyes takes about 2 thousandths of a second for your brain to register it and form a picture of it.
It is logical therefore you cannot experience your own death, so all you will ever possibly know is your own existence and to you as with any sentient creature will not experience death, ever, as that is impossible.