(IIRC the story correctly)
Never really understood why the MC was so fixated on returning to a nation that basically betrayed him, especially since he's making a name for himself well enough in a new place.
Going on the old game, at the start, he didn't have a feel for the scope, and is acting as a stranger in a strange land--take what women he can, and escape. (His desire to regain what was unjustly stripped from him--and take revenge on the king who betrayed him--plays a role, as well.)
As he gets more accustomed to the land and government, it becomes less about getting back to his old land and more about getting
out of this one. The Ratan Empire is a very transparent expy for late-stage Rome. It is on the verge of implosion, and he realizes that all too well. Fixing the society would almost force him to conquer it first, which would take more time, lives, and resources than he has any desire to spend, and he has no interest in sticking around while everything falls apart around him.
(He may end up having to anyway, because the angels and demons are playing games--but that's a different set of motives.)
