My Fifth Grade “Paradox”

When I was in fifth grade I, along with a few friends, were very much into the world of alternate realities, past lives, and different dimensions. I had an entire past life, full of love, friendship, tragedy, and all the aspects of real life now. I built an entire world with their help, including a runic alphabet, profiles on the traditions of many of the other dimensions, and characters. I recorded it all in a notebook along with my age, the age of my past lives and my current life combined. This notebook holds the entirety of the alternate universe I made with my friends. Along with this complex universe, we devised a "time paradox." This time paradox stated that history would go it's course until reaching a turning point, where from then history would go in reverse. Different names, different groups of people, but same underlying principles behind it. None of us ever fully established when the turning point would occur, but it was sometime in the early 2020s. Since 2020 is approaching, and this challenge popped up, I wonder..

could fifth grade me have been right?

If so, prepare yourselves.

We're going to get to relive the best (and the worst) parts of history.