The computer “doesn’t want” to play.

Based on what was written, the answer is no: "The opponent is stronger than me in terms of both army and skills, he is not blocked by any creatures or terrain, he has over 500 magic points, and after about 4-5 months of gameplay, he simply stops, meaning he just stands in some 'corner' of the map and does nothing." In principle, something similar might have happened, but the AI was weaker and focused on capturing distant territories. And if it was stronger, it would come back to reclaim what was lost.