I change things up a bit in my diet and exercise. Exercise routines that work out the same muscle parts as well as types of cardio I am doing.. for example.. if I use to do bicep curls with weights for muscle toning my arm, I change to using rope curls.. working same body part but different exercise... for cardio if I do treadmill one week I change to stairclimber the following week...
The science is confusing the body.. that confusing forces the change in weight loss..
Try changing up your routine - both diet and exercise. Randomly add/subtract calories each day. Switch to different exercises, etc. Once your body gets used to a certain amount of calories and/or exercise, that's what it expects and if you don't change things, there no challenge.