Concept 1:
It would be crazy to get a gamemode where u are like swat and performs house raids like in ready or not when you can get a group of people and you all can raid houses together and secure intel and shit. That would be crazy fun consideing the physics. So like you guys add arrests and commands you can shout at the civilivans and criminals in that specific gamemode like something READY OR NOT Inspiried.
Concept 2: A PVP concept like search and destroy or some like a Counter Strike inspired gamemode where u have different maps. That Would be really great and i think it would have a nice replayabilitiy thus making the game feel fresh and good
Concept 3:
A solo/co-op campaign would actually go so hard where u could play through the story or maps in order where u have a nice experience with GOOD AI that is really important in Solo/Co-op shooters. It does not even have to be like a real long campaign just something nice that you could play like some larger maps where u have an objective and need to extract or take someone important out.
Concept 4:
A horde gamemode with something like cod zombies where u kill zombies get guns and from there u can progress to other levels with the money/points u get for killing the zombies.
Concept 5: A big open world map with like 50 players competing for the win. So something like Population one Or Contractors Showdown.
ADD A NICE REACTION IF YOU THINK ATLEAST ONE OF THESE SHOULD BE ADDED