I Became Humanity's Villian, So it Doesn't go Extinct

Human's greed, and their strive to be even more powerful than one another is the cause for their development, which stagnate by peace without a common enemy. The year 2080, a screen popped up in front of everyone "Requirements met, transferring to [Jakraval]". Jakraval, a hub and a battle ground for all planets' species to reign supremacy while looting resources for further development. Humanity stood no chance against all species who's constantly at war at their home planet. Read, as how our protagonist return to the past to train humanity for the Jakraval war ahead of them. (This is a work of fiction, and i love peace lol)