Congrats on the 50 pounds! That's amazing!
I'm of no help, though. Something snapped in me when I lost the 60 pounds--it was just time. Then, I gained 10 before Covid (which was kinda good because my hair was falling out) but another 20 during Covid. The extra 30 is making me feel bad, but not bad enough to stop eating cookies. I'm trying to get back on track, but I'm just not motivated right now. It's like all that hard work disappears so easily if you stray for even a little while. And, it's even harder at my age.
I hope you find it in yourself to continue and not get discouraged by your plateau. Even though plateaus are annoying, you have good numbers which is a huge plus.
I said to myself, "After I finish off this cookie dough ice cream container, I'm done with goodies." That was last week. We'll see how it goes.