Witcher III is available for XBone, and it's probably not even that expensive five years later. Definitely the place to start for a single player title.
As more of a dark horse pick I would recommend Hellblade: Senua's Sacrifice. Kind of a dumb sounding name but it's an excellent game.
Unfortunately the vast majority of good single player games are solely available on PS4.
__________________
"The great promise of the Internet was that more information would automatically yield better decisions. The great disappointment is that more information actually yields more possibilities to confirm what you already believed anyway." - Brian Eno
|