Time-travel LitRPG

In the final moments of a battle on the highest layer humanity had reached, humanity lost, easily crushed under the heel of those more powerful.

Suddenly, Adonis finds himself four months before the summoning of humanity to the first layer. An unknown force sent Adonis Newman's memories to his younger body 38 years back in time.

Something has gifted him and humanity a second chance to survive their ascent up the layers.

Can Adonis become a leader of humanity? Will he regain his former strength and strive beyond? Will he even remember the events that spiraled out of control, condemning much of the ununited humanity to die in their ascent against their powerful foes?

Billions perished unnecessarily. Will the fraction he can save be enough to make a difference in the grand scheme of things?