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I also messed up the first time... I went the wrong way... wasted time, and the armies were just terrible... in reality, everything turned out to be simpler:
1. Give Irina the army of your crawling companion.
2. In the first few days, develop the city to level 3 and build as many creatures as possible by the end of the week, while capturing and collecting everything around you as much as possible.
3. Then, build up your army and, after about a week, capture the upper left city (as part of the quest).
4. Then, go down, cross the water to another city, and get the quest to clear out the demons at the lighthouse, complete it, and this city is now yours.
5. Now, the main thing is to quickly develop the cities.
6. Build up your army, periodically defending against raiders, and go to another human city.
7. Next, gather a worthy army, defeat the demons, capture all possible remaining cities, and with 300 dragons, no Queen is scary; she won't even have time to squeak, and Gerhard didn't resist for long either )))
So, it turned out to be quick and easy.