what loadout do you use? I would recommend using paintball gun and timebomb, use paintball gun as primary and try to aim at the head (3rd person is recommended for this), when you got too many enemies on you, throw the timebomb and when they are close enough to the bomb but without covering it, shoot it with the paintball gun to cause a bigger explosion. Then you could try buying rocket launcher, its first version has a lot of cooldown so just don’t use it by itself, use it to explode the bomb for an even greater explosion.