He will reincarnate. He will reincarnate in the prehistoric times. He will reincarnate in the world of dinasours inside a magic world. He will reincarnate to become the first sage of the world. He will reincarnate to shape the world as an immortal.
In short:- Mc will reincarnate as a caveman in the prehistoric world as an immortal who can be kiiled, but won't otherwise die, and the world is a magic world.