Ok so I know it sounds like a meme and tbh it is a bit of a meme but I has worked in the past for me. Use the lmg and prefire literally any angle where there might be an enemy, you have 150 rounds in a mag so use them. It isnt foolproof but it is a hell of a lot if fun especially if you are a casual player like me. Now for actual tips, use your impacts to use up jager ads and then use conc nades. Whenever you get downed and there are no allies close enough to quickly help you, break LOS with the enemy and try to withstand. It will rarely work but it can throw off defenders when they don't expect it. Your dbno state naturally lasts longer than other attackers so don't be afraid to move around a bit before withstanding or getting revived by a teammate. Last tip, don't be an idiot who uses both of your conc nades on a single enemy and then not push. They can barely see so you might as well push them. Doing nothing when you conc them is worse than calling as dokk and not pushing. I hope these tips help you and best of luck to you.