Suggest new ideas here.

I think it would be nice to introduce weather events into the game. For example, a snowfall in a snowy area, a sandstorm in the desert, rain, etc. As a result of the snowfall, roads could be blocked by snow, which would make it difficult to pass. As a result of the rain, roads would be washed out, etc.

I had similar thoughts. Change of seasons:
Winter - minus growth for all Castles, except for snowy ones, and minus 10% movement for everyone, except, again, for snowy races - like dwarves and ice elves.
Spring - plus 10% movement for everyone, except for snowy races, and +10% growth in Castles.
Autumn - evil races - Necromancer and Demons - get a 10% movement bonus.
Summer - neutral monsters appear more often, everyone gets more experience. And other similar bonuses.

Or, for example, wind in sea voyages. But, in my opinion, all these things are a bit superfluous. Everything is already great, and introducing such things will lead to unnecessary complications in the game.