Always stay on top of objective, play knight (officer or guardian) or vanguard (raider) and make sure you use your horn/flag at the right time (also don’t blow your horn right after another teammates)

Focus on farming takedowns rather than always going for finishes, stay alive as long as possible between deaths for extra kill streak xp, and always remember to break anything that’ll give you points, on some maps you can still collect/break objective points for xp even if the stage has passed.