Frustrated, need help

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I've lost a grand total of 153 lbs in 2.5 years, but the last 2-3 months I have fluctuated around the same weight. I'd like to lose an additional 57 lbs (I'm 207 lbs, 5'8'' and male, I'd like to be 150). Not sure if I'm in starvation mode or what, before I started back calorie counting, I had estimated I was consuming around 1300-1600 cals per day. So I had upped my intake a bit to around 2000 and ended up gaining a few pounds. I lowered intake and lost those pounds I gained but now I'm stuck again. I tried lowering to 1000-1200 again with no luck. Cut, add, nothing's working. Not sure how to get out of this vicious cycle.

Side note I exercise 4-5 days per week, changing up between treadmill, bike, and weights.