Been a while since I had any sort of dream that I can remember. Even longer since it was anything fantastical and not some sort of strange metaphor laden minefield.
In any case, it started in an agrarian style earth, only the clothing was very modern. It focused on a boy that wanted to see the stars. As time went one I began to realize that this was a future earth, only aliens have arrived and they have prevented humans from using modern technology for some reason. Most of the population of Earth is focused on subsistence farming, as the aliens have outlawed “modern” technolog. The farming is done with simple tools, and there are domesticated animals like oxen.
Humans that did not want to live this simple lifestyle were allowed to work in large modern cities that were actually prisons. They provided much of the amenities that we have today, although you cannot leave once you decide to live in the modern era.
One way or another, the boy ends up on a space elevator, past the shield that prevents humans from leaving the Earth, only to find that there are no aliens at all and the whole thing has been set up by humans from the future that wanted to prevent what happened to their Earth. I’m assuming that there’s little to no causality and there are alternate timelines created.