Struggling to add muscle mass/gains... what am I doing wrong in my diet?

I am a 5'11", 29 year old male and I have hit a wall around 151 pounds. The last three months I have upped my calories to 2800 and am consuming around 200 grams of protein a day along with strength training workouts 4 to 5 times a week. My job is pretty sedentary so I don't burn many calories outside of the workout. I saw zero muscle gains and weight gains in that three month time. Am I not timing my nutrition correctly? Do I need MORE calories? Help! Thanks in advance!

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