So I am thinking about the second world he should travel is to some kind of God world like The Blood Of Zeus, God of War, Clash of Titans, The Immortal or some world similer that doesn't have gods but they are not too op like DXD, Aasura, Campione
A balance world that doesn't turn him too op.
Anyway it won't be coming anytime soon as he least needs to 25th order to able to travel other planes, as chapters don't worry next 50 chapters are ready they are in raugh draft and I need to add final touches some fights here and there and other things it's just I am working in. I'm taking suggestions so soon because I need to do full research on that world.