hi there
man….
earth is a larvae stage for growth and learning to maneuver on the physical plane, it teaches the consciousness of the soul/body. The soul then moves on as thought/consciousness into almost a moar vivid creation, without the confines of physical D. 3D constantly "improves" or grows so that 4D can grow. Different beings up the ladder to 12D or at least thats how far we are now :) each dimension you move up gets better, happier, more positive.
Negativity must be felt to maintain equilibrium balance of the "energy" as you would call it. Can't have action w/o reaction of positive or negative, cause and effect.
Christ positive….Antichrist Negative
We had to include Negative in Realms to move us along, improve us, motivate us. We occasionally come back "in time" as you call it, to fix or trim things to "improve" master current events (12D). That is, in a sense, how we survive/continue at the front of the 12 car train.