Wanderlust: Strong longing for or impulse toward wandering (Merriam-Webster)
We often think of 'wandering' as the act of going aimlessly from place to place; it is okay if you think that, you would not be wrong.
To me, it means much more than just changing your geographical location. We can wander in our own homes, drift away from reality on our chairs, migrate to other worlds with a pen in hand. Places where none have ever been, stories that have never been told, realities that exist only in the minds of those who heed your words.
One could call acts of writing, reading, imagining, and philosophising other ways of travel - the only difference being what you choose to impose as a difference.
After you got killed prematurely, a goddess from another world decided to bring you back to life in a fantasy world. But in exchange for your new life, she asked you to do her a simple favor; not to kill the demon lord, and do not interfere with the hero in any way possible. And that was a simple request you agreed to, but not without its consequences.