there are only 3 possible ending,
1- there is nothing.
2- there is something.
There can't be "nothing", the idea of nothing doesn't even make sense, The only thing you know is that you exist and that you're sentient, there is no reason to assume that if you binded a rope around your neck your sentience will suddenly cease existing, that being said if there have to be something after "death" assuming that it exist (seeing as if you never died before), will it be some new life or this same life? (read: reincarnation or eternal return), the problem with reincarnation is that you'll have to define what is sentience, and to proof its existence in creatures other than you, nearly every organism can be reduced to simple interaction between moleclues that determine its behaviour, and when i mean sentience i don't mean awareness, i mean sentience like yours that can't be reduced toward simple physics, the reason being that you have to assume you sentience and awareness of the "physics" that exist in order to assess it, you have to assume the existence of an observer which is you form any conclusion or knowledge, "I think therefore i am" .
you can't assume that there are any sentience other than yours, so the only thing you can know and affirm is your own life, after you "die" (you can't die) you'll just return again like everything else and you sentience which is binded by your body, will remain there, you won't become anything than you, because to "become" you'll have to assume your being, which is defined by yourself, After you die you'll just return again endlessely