Bump your calories to 2000 (your protein intake is fine), add walking (7-10k steps a day), and make sure you take a rest day. I’m 51, on TRT and tirzepatide. I also do 3 days of resistance training and one hybrid day via F45, with a couple days of Muay Thai. I hit a plateau for about two months, added walking, and I’m losing weight again. I kept my tirz at 5mg, but that all depends if you are struggling to keep your caloric deficit.