Absolute power.

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RITER

I don't understand the point of such large maps; it's just pointless, endless running around. To make it difficult, you need to make it 1x7 and have less impressive barriers between locations. On any difficulty, the computer has much less chance against a player if the player has had time to level up; even a significant advantage in troops doesn't help. There are too many artifacts on the map; I was selling them in whole batches, buying weekly growth in 4 cities just from selling artifacts from corpses. I collected all the sets available in the game.
For a month, I watched two very strong Necromancers "dance" in one place: one takes the Outpost building, and the second, on his turn, comes out of the Castle and takes it back, and then goes back into the Castle. Until the main character arrived and killed them both. I'm playing with a mod for smart AI.

The computer breaks through outposts on the hero in the first, sometimes the second, month. The player doesn't always have time, although it becomes possible by the 3rd week. Either it clears the opposite half or goes straight for me. Try without the AI mod; maybe it's making it stupid. Of course, we start the game from the beginning and don't use any old saves. Which mod are you using exactly?
On the Warrior (on this difficulty, the computer builds buildings twice as rarely, so it won't even have time to build a decent army), I noticed that some of them are slow; I definitely saw that an Orc couldn't break through an outpost when I was playing as a Necromancer, but I defeated him on the 4th week; maybe he just didn't have time. Well, the map is a skirmish, not a single-player game.