I Have a Time and Space Ring

What do you want to do most when you own a space-time ring? Travel through time and space? Or go to the past and change the outside world? Maybe all this is possible? But when I actually owned a space-time ring, I embarked on a journey of constant escape! Travel through time and space in multiple universes, each time and space has its own uniqueness. As I travel again and again, my abilities are getting bigger and bigger, and of course the responsibilities I face are also getting bigger and bigger. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.