the opponent uses 6 defenders, 1 MC and 3 attackers, most likely he defends well and long ball counter, you don't want to attack the wings nor the middle, you want him to attack you. To do so pack your men in middle and play controlled football with short passing, pressing whole pitch. 3-5-2/3-6-1...anything will work as long as you space your men close and utilize short passing, high pressing.