I have a suggestion.
What if there are criminal organisation bases that spawn with like a leader in them and if you join you can get like special effects or something
Eg. You join Team Magma wearing a Magma Uniform, you join, and you get lava protection or something.
Idk. Or, maybe, they could be just NPCs that attack you no matter what throughout the map?
Just a suggestion. Thanks for reading! I'm sorry if I shouldn't be suggesting things