I'm only 7 months out, but I've stalled a few times. My dietitian actually gave me a plan for what to do if I stall out for two weeks or longer, and that's change things up.
Intermittent fasting, changing up your exercise routine, adjusting your calories throughout the week (doing 500, then 1000, then 1200, and then back to 1000, 500 and repeat). Stalls are there because your body got used to what it was doing (most of the time, there are other medical reasons for stalls as well, like constipation and gas and such). If you are only doing the elliptical, maybe try lifting weights or doing a rowing machine? Change it up. Your protein goals sound fabulous, but maybe add a few carbs in there here and there.
It's a lot of trial and error trying to figure out what works, which you obviously know. I think your weight is great, and you have done amazingly. Just hang in there, okay? ❤️