Play against Necropolis.

Why diplomacy with Orcs? They'll crush everyone anyway. You need to take everything with Wrath. You can also assemble a cannibal build and use the hero Argh. Hmm... against the undead, focus on Darkness because your opponent will likely want to cast Berserk on the Cyclops. A gnome build would also be good. And what hero does he have? A GHOST?))))... You also need to focus on defense and, of course, attack. Also, use machines with goblin reinforcements and try to eliminate the liches. If there are no liches, your defense and Wrath will be enough to win. But if he uses summoning traps, they'll reduce Wrath, so you need to buff your own units more.