Ideas and suggestions.

I don't know why, but I haven't laughed so heartily on the Heroes forum in a long time.
Keep writing, no irony intended :)

But how do you think new castles should appear?

You play HotA, and yet you complain.

Inferno could have been added to the game (especially in HotA), as could a skeleton converter without requiring a Fortress. The Treasury and Fountain in the Rampart could be made cheaper. The ability of monsters to reduce armor could be reduced, from 80 to 60, for example. The Grail could be reduced from 5 to 2500, for example. The initial growth rate of creatures from levels 1-6 could be increased by 50%.