You can do many things. One, use another playbook. Two, try blitzing more. Three, not play as them any more. Or 5, stop playing Madden and watch them play defence well in real-life. Just kidding about the last two, but maybe you could also mix up zone and man as well as other things. You don't want an offence knowing what you're going to do. You want them to guess what you're going to do next. Getting in a player's head is key. That's why I mix it up all the time.