Looking for some advise?

So long story short 2 years ago I weighed 290lbs at 5' 7" at 49 years old. Got to 220-215 at the start of this year at 51, and started hitting the gym, easy at first 3 days a week with strength training. I'm now hitting the gym 5 days a week with weekends off and just cardio. Using Gravl for the workouts. Currently running a 1300-1500 calorie diet with 160-180 grams of protein a day. My BMR according to In Body is 1800. I got to 201lbs a few weeks ago and stopped dead cold, really crushed my spirit, now I'm holding at 207lbs. My last In Body scan has me at 204lbs, a BMI of 32%, and 27.1% body fat. I'm looking to drop more weight and build muscle, my goal is 170-180lbs. Where do I go from here? And why the plateau?