So I have a lot of suggestions and I really think you should think these over.
A squad system (like in battlefield) where you can have up to like 4 in a squad and the squad leader can go into a game and it brings the squad
A mode where only certain maps are allowed. Example: TDM only allows a desert map because the size
A frontline mode where theres sectors with 2 points and one team has to defend and one team has to capture them to move to the next sector and after the attacking teams gets all 3 sectors the game is over or if the attacking team loses all of its kills (the defending team needs to get a certain amount ) then the game ends. (It’s in battlefield so look at the game for a better example)
A loading screen in between the main menu and game scene
A battle pass
Air assault. It’s like team death match but in the air
A plane addon
A missions mode where people can complete missions (like defeat all the enemies) (it’s against AI)
Better weapon system (like you have 4 weapons from WWI and 4 from WWII). You could have that as an addon too
Make it easier to add scopes in scope pro
I might have more later but that’s all for now!