Welcome!
You are losing at a normal rate as a 'lightweight' with a sleeve. I assume you've been sleeved since this is posted in the gastric sleeve forum.
When's the last time you previously lost 15 pounds per month through the old-fashioned way of diet and exercise? I suspect the answer is "Never."
You started at 200 pounds. Please realize you'll never be one of those people who loses 30+ pounds monthly like a house on fire because you weren't that morbidly obese to begin with. The bigger the person, the faster they tend to lose.
Realistic expectations are important during your weight loss journey. You didn't exactly become 200 pounds overnight and it will not fall off overnight, either. In fact, expect the rate of weight loss to slow the hell down from this point forward.
I started at 218 pounds and had lost 27.5 pounds at 2 months out, so you are actually losing at a faster rate than me. After the first 2 months I lost at an average rate of 3 to 6 pounds monthly. However, I'm pleased with the final result: I lost 100 pounds and have kept it off so far.
Good luck to you.