How do I break this plateau?

I am 8.5 months post RNY and I've lost about 110 pounds. I would like to lose another 50 pounds, but I'm thrilled with my progress so far. In the last 6 weeks, I've only lost 5 pounds or so. I am getting in my protein (60-65g), supplements, and water (70-80oz). Carbs, overeating, and grazing are not issues for me, so far. I play tennis for an hour 6-7 times a week. Prior to playing tennis, which I started around the time my plateau started, I was walking for 35 minutes 4-5 times per week. I think this is the only difference in what I'm doing. Could my increased activity be contributing to this plateau? Any advice? I'm so scared this is it for me.

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