It is actually great that you've stabilized for now. I know you want to get 20 more pounds off, but realize that what you've done so far is pretty much impossible to do for 99+% of people. This prolonged caloric deficit also makes your body's hormones go haywire. So it is a really great idea to stay at maintenance for a while to let them normalize; this will allow you to be able to see results more easily with your deficit diet when the time comes. Congrats again on this amazing feat, and don't worry about the current weight plateau.