help against this formation

[Tactician]

3-2-3-1-1 worked because you used mixed passing and the defensive wingers are not marked at all. I'm sure you have used red arrows on the defensive wingers.
The 3 CMs and the AMC hold the opponents CMs and DMCs, preventing them from moving out of their position to go mark someone else, for e.g a defensive winger moving forward. If they move, then space is made available for your CMs and AMC and the mixed passing comes into play.