My Suggestions

I'd like to have a map sandbox as Mount & Blade.
Where you can decide what and who conquer.
Or something similar to the total war series, where to build our fortresses etc.
In short, with a management of the own faction.

Consider also those who enjoy single player.

I know it's designed for multi but ...

It would be nice to have some RPG elements like M&B by creating strategic alliances and so on.

My fear is that, if based only on the clashes in the long run become boring

Best regards