I continue to admire you for all you've accomplished, and I hope that you will continue to applaud yourself for this project in spite of having hit a plateau.

I have one idea but it may not be right for you. Lifting weights and increasing muscle mass boosts your metabolic rate. Even lifting very light weights will build muscle mass. The only thing is that once you start lifting weights you have to keep doing it; I stopped a few yrs ago and it led to more weight gain. If you went for this idea you'd need some 5 pound weights and a video about safe weight lifting.