You time travel every time you hop in your car to go to the store. It’s basic relativity. That’s why GPS satellites have to have a time-correction of 45 micro-seconds/day. Time travel is easy: just go fast or hang out near a strong gravitational field. You can slow and speed up your time relative to everything else. Problem is, you can’t make it go backwards.
Or quantum bridge...
The faster you travel the more time slows and space shrinks. So theoretically at the speed of light the universe shrinks to a point and you’re everywhere instantaneously and time stands still.
There’s somebody who claims to be omnipresent, omniscient, omnipotent, and everlasting.
Maybe he’s traveling at the speed of light?