What do you think happens after you die

i think you are born and live the same life over and over again, thats why some things feel like deja vu sometimes. but like every life theres little changes or you die in all sorts of ways.
ALSO i have like this theory that everyone has a set determined lifespan and if you die before that set date you continue where you left in another dimension(?, like, for example, you tried to kys but failed, maybe you actually kys in one timeline but continued in another one as if you failed.

i think about this a LOT but my pea-sized brain cant come up with the right words to explain it correctly