You have two options.
Option 1. You may do an Apple Day. In an Apple Day, the only food you will eat are apples. You will consume up to 6 apples that day. (You may eat less, but no more than, six.) You will drink plenty of water, and may still consume coffee and tea. In effect, this is a mini liver cleanse, and should break your plateau.
Option 2. You may have a Mini-Steak Day. Similar to the Steak Day during Retrain Phase – except this very lean steak is only the allotted 3 ounces, and may not be cooked in fats or oils. You will have fasted all day, and will choose either an apple or a tomato to eat with your steak. You will drink plenty of water, and may still consume coffee and tea. This should break your plateau.