Your start seems very slow; you take your second town on day 6 of the second week with an army of 7 Fanatics, 102 Heavy Archers, 2 Angels (didn't get a boost in the treasury; there were only 50 Griffins), and about 17 Royal Griffins (gave the champions to the liberated hero). The Griffins were split into groups of 1+1+1+14. In the first round, I flew in with 3 groups of 1 Griffin each, right up to the Grand Elves and Snipers, and also made sure that the upgrade Gnomes stayed near the Archers. The Angels waited, and I cast Expert Blessing on everyone. My ranged units shot at the Snipers, and at the end of the round, the Angels attacked. In the second round, I had to use Lightning Bolt to finish off all the Archers, then I slowed down the Gnomes one by one (I had Earth Magic level 1), and finished them off (the Griffins' goal is to prevent the Archers from shooting for 2 turns). The skills were Archery level 3, Attack level 1, and Water Magic level 3. With Expert Earth and when the Angels level up 2-3 times in the dwelling, it becomes even easier. The result: 17 Griffins were lost, and the town is ours, and on the second week, there is a Portal of Glory in the first town. If you build 2 Magic Towers, you can forget about the Portal, and you won't have time to take the second town in the second week.
After that, on the way to the Dwarven town, take 3 more Angels and Archers in a week, upgrade everyone, get a few Griffins for meat, and achieve the same result with the third town (here, you can also blind the Snipers).
I took this town myself with Blindness and by splitting the Archangels into 2 groups, with no losses.
In general, thank you for the detailed description. I haven't been able to complete it yet because I ran out of time, and now I've encountered a version of the map that isn't very good, and immediately after killing Vandroy, the Titans attacked me with all their might, especially 3 heroes at once: Josephine, Fafnir, and Solmyr. I killed Josephine by hiding in the town of Alondo (she came herself! This didn't happen in my first attempt to complete the map). Fafnir, with his stats of about 70, while mine are about 50, I can't even kill him while sitting in the town. I leave the Titans (I haven't had time to get the Sphere of Vulnerability yet, and even with control over more than 1 unit, he uses Armageddon and clones on the Titans, and... death). And there's no point in even trying to attack Solmyr with his 230 Azure Dragons. By this time, without losing 1 Archangel, I had 376 of them, and they kill only 5 Dragons with 1 hit.
Can you give me a link to the map you played, if there wasn't such a disadvantage there, because in my situation, I'm completely stuck.