A Light Not Extinguished [40K Dark Age What-if]

We all know the story. The Men of Iron rebel, humanity degrades into barbarism during the Age of Strife, Slaanesh is born through the depravity of the Aeldari Empire, the Imperium rises and falls and the galaxy burns in strife and bloodshed.But what if that which was ordained never came to pass? What if the Cybernetic Rebellion never happened? Can humanity defy the dark fate written in the stars with blood and sin?

I DO NOT OWN WARHAMMER 40K, THIS IS AN UNOFFICIAL 40K FANWORK