Plateaus are tough. I'm in the middle of an 18-day one, myself. One thing that helped me is that I analyzed the SP reports from the beginning of my plateau to see if anything changed. I realized, with the help of SP friends that I may not be eating enough because I'm now exercising about 200 minutes a week. Yes, that's a funny problem to have, so I'm going to vary the range of calories I eat to keep my body guessing. If that doesn't work, I'm going to tweak my exercise program.
All I can say is "hang in there" and stay patient. This is what I'm trying to do because I REFUSE to give up.