Idea about what comes after death

Civilization has already discovered what comes after death. It is impossible to live life or experience time without consciousness, therefore when people die they are reborn again because nothingness and death are timeless. Discovering this knowledge would lead to the lack of human inhibition and motivation to continue living, therefore the civilization who discovered this knowledge either vowed to keep it a secret or destroyed themselves intentionally. Truth is not happiness, only suffering and pain.

(Just throwing this out there dk if this has already been talked about)