Five to go...
When you reach a plateau with weight loss it often has to do with your new basal metabolic rate and the fact your caloric intake is now matching that new set point.
Recalculate your BMR and the consume 500 fewer calories per day to lose 1 lb in a week. Alternatively, increase your exercise
so you burn 500 more calories per day for the same effect. Combining the two will work even faster.