I’m level 25 and need help lol

Kind of slumping here. Been playing pretty consistently this whole wipe and seem to be struggling the most I have for the past two weeks. It feels like my m855 with my m4a1 are doing very little damage. I know it’s not the gun or the ammo, but the person wielding it. That being said, I’m thinking maybe I need to try something different to give myself a bump. What would you all recommend? MCX? Something else? Just looking for some recommendations! Thanks everyone!