A few 4th quarter, situation-specific strategies if you're still in the running for this:
1) If you've held the opposing team to single-digit yardage and are kicking off, consider an onside kick. At worst they'll get the ball around the fifty, leaving not enough yardage for a touchdown score to put them over 67.
2) If you've held the opposing team to around 60 yards and are facing 4th down, call a shotgun play and race backwards, letting yourself get tackled around the 3. You'll turn the ball over, but your opponent can't get more than 3 yards of offense before kicking back to you.