4-3-3 (3mc) is not a very strong team in the game, the rules and the defensive midfield but offers very little going forward.
To win against this classic shape and beat it, you need to keep the midfield while strong in attack, what I'd recommend is a V-shaped 4-1-3-2 with arrow attack on the DMC effectively turns him MC a while you are attacking.

1DL-2DC-1DR-DMC-3MC-2 ST ( Def Nomrmal )------- wIN 90%
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