I would say Chronicles of Primordial Wars but that only comes up in the first 50 chapters and later is more focused on the mentality until he assimilates.
Reverend Insanity. The MC has a cheat that allows him to go back in time. However, there’s a large probability of failure every time he does, and if it fails he will die. Obviously we readers know it won’t fail for whatever reason, but it’s a good reason in-universe for the MC to only use the cheat when he’s desperate. It also makes sure he makes full use of every advantage he can get from his rebirths. It’s a very good read.
The King of the Battlefield 72 Demon Gods released after sealed by solomon, and they want to revenge by destroying humanity. Solomon summoned humans to fight in the underworld before the Demon Gods gain their power back. With trial to make them stronger. But After tens of years the Demon Gods didn't attack. So the human fight with each other to gain authority and power. Follow the MC, an assassin who has been brainwashed and kill every promising human back to 40 years in the past Btw it has a very very good plot twist with the mc story