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In week 2, you need to capture a Utopia on Barbarian respawn and use that money to buy Archangels and upgrade them. The main thing is that the artifacts in Utopia give good stat bonuses. At the beginning of the second month, you should have around 50 Archangels and a large number of Monks, the rest being cannon fodder + hero stats, preferably around 20-30, with mass magic like Haste, and I think they will fall easily.
I set the difficulty level to "Ship" and managed to kill the Elementals at the beginning of the second month. I captured the Necromancer Castles on the islands and one Demon Castle. After that, I couldn't find a way forward. I spent a long time studying the map in the editor to understand where to go next, but I still couldn't figure it out. To get to the Cyclops, you need "Walk on Water," but it's nowhere to be found. You also can't get to the starting Purple Castles. I killed more Elementals on the other side of the whirlpool, but you can't land there either.
Update. I now understand that you need to land where the Chaos Hydras are, after fighting the other Elementals. But the problem is that when I sailed up there to capture the Necromancer Castles, Red teleported there and captured all my Knight Castles. And since I couldn't completely kill the Necromancer, his growth still increased.