The game needs a ranking system similar or the same as what Halo Reach had. It’s gives a sense of achievement and shows ability of players who have committed more time to the game.
Working in conjunction with the battle pass (similar to Call of Duty) it could offer additional rewards for ranking, including XP which can go towards the battle pass ranking!
As it stands, the only rewardable progression the game currently has is the very long winded grind of the battle pass, which doesn’t provide any real levelling satisfaction until you have played at least 3-4 games, which even then it could possibly provide you with a few hundred xp towards the next level of the battle pass.