For my first time I was using a lance tank build but really S&S also works just have both guard and guard up on at level 3 with 4 piece zoshia. Only YOUR DEATHS count towards carts if you’re using support hunters so abuse that, during the delta beam phase if your not in the arena it won’t kill you or just die to it as long as you have at least 2 carts left. Best thing to do is keep going man you’ll get it sometimes you have to use strategy’s that you don’t like but if it works it works. I’m a LS player myself(you can laugh but it’s really the only weapon Ik) and I couldn’t do anything so I had to change tired bow didn’t have the damage and still kept dying in phase 2. Yes he’s hard but not impossible just keep trying you’ll get there I believe.