I Am Free and Happy in All Worlds

I have a system that allows me to travel across all realms without any constraints. Even if I have one, it should be due to my own weakness. If I don't have money, it doesn't matter. I can go to a world without life but with a lot of gems and gold to pick up a few pieces. If I don't have power, I can go to martial arts, immortals, immortal cultivation, magic, fighting spirit, mythology and other worlds where I can train myself to learn and practice. I want nothing in the world because I am invincible. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.