The GluttonEater of All; Bàoshízhě; 暴食者; Return of the Devourer

The human world was destroyed by the demon lords. Having lost everything, the awakened warrior Si Chen chooses to launch a desperate, final attack sacrificing himself in order to take down the demon lord of gluttony, Lan Yue. But when he wakes up again, he finds himself transported ten years into the past, before any of this happened. Realizing that his powers have awakened earlier, he decides he must act early. With his return, everything else in the world seems to have changed as well