If you are using a Fitbit, what kind of calorie deficit does your Fitbit show?
While I follow WW, I record what I eat in My Fitness Pal which talks to Fitbit and gives it my calorie intake so I can see how many calories I burn and whether I have a deficit.
Having lost almost 45 pounds myself I know that I now burn fewer calories since my body is smaller. So to lose the same amount of weight I either have to increase exercise intensity or exercise for longer time or eat less. I am already at the minimum on eating so increasing exercise intensity or exercising for longer works better for me.