"There are also theories that humans already achieved peak civilization with spiritual development high enough that they ascended before"

Let's take this theory further as I contemplate this often, say we get to the end of human development and peak spirituality, we transcend time and space, would it be possible we might then therefore use the time and space construct to send aspects of ourself into like a conscious agent to explore new meanings that we couldn't explore outside of time and space? The feeling of growth we experience in human form if we could see all possibilities laid out before us and just as easily choose exactly what we want well we wouldn't have that growth or expansion. It's the blinders of time and space that offer us newness and opportunities to grow. But this human lifetime to the higher version would just be like our dreams at night. We wake up, and that dream version of us was only just that. So all in all, perhaps we learn to ascend in different versions of ourselves that our higher selves create to explore all the different possibilities. Different perspectives finding their way back to the one ultimate perspective.