The Devil's Self-Development

After an accidental time travel, Li Buyi became the new Demon King. He could declare loudly: I have peerless magic skills. I can pick up the sun, moon and stars with my hands, and I can make the continent fall apart with my stamp of my feet. Unfortunately, I can't practice it! I have tens of thousands of subordinates, and I can turn many enemies into ashes with just one finger. Unfortunately, I am not very loyal and may betray you at any time! I have hundreds of millions of enemies, and everyone wants to kill me, as if I am the legendary top baby. As long as you kill me, you can reach full level instantly! To become a demon king through time travel, without the help of the system, let's cultivate ourselves!