So I think there should be a new ranking system that could be added for both Predator and Fireteam.
It would work similarly like a Prestige system. Once you reach level 100, your Predator rank resets to ‘Unblooded’, and your Fireteam rank would be ‘Private’.
From then on any and all XP you earn will go towards your new rank, and with each rank you earn either a new badge/ outfit for Fireteam and new trophy/ armor to display for Predator.
The ranks could go something like this:
Predator:
Unblooded
Young Blood
Warrior
Elite
Veteran
Elder
Fireteam:
Private
Private First Class
Corporal
Sergeant
Sergeant First Class
Sergeant Major
With Predator you could also have certain acts that are punishable and you become temporarily marked as a ‘Bad Blood’ and you could be locked out of using certain weapons or your cloak doesn’t work or you have some sort of debuff.
Perhaps if there’s only one FT member left you can challenge them to an honourable 1v1 and if you win you get bonus XP.
Just think something like this would give the game a bit more replay value and give people who have already reached max level something more to work towards.