I suck at all non-1v1 modes. How to improve?

All my non-1v1 ranks are about 200-300 ELO lower than my 1v1 (around 1100). I always try to use the exact same 1v1 strategy but so far it has worked poorly. I’m a USF main. Is Allies just bad for group games in general or do I need to develop completely new strategies for group games?

Any tips?