Would like some help thinking of gameplay mechanics

Hello developers
My game idea is a crusade based game
Where there are two teams who fight each other
and the team who has the no player left loses and opposite wins
I would like some game play mechanics and want you to suggest
Here is a game it would be similar to


To take some ideas from For Honor:
Have large ballistae that you can use to shoot bolts at enemies. It would be a cool medieval themed turret.
Add special abilities with cooldowns for example, calling in a catapult strike or arrow volley.

To take some ideas from Battlefield:
You could have different classes. I personally think a horse-mounted class would be cool, but you’d probably have to limit the amount of players in each class.