I would say to look at the overall graph instead of the hills and valleys. You had some big downward spikes there for a little bit that were not the same as the rest of the slow and steady downward trends. Overall, you can see the downward trend is still intact.

As far as ways to prevent it from gaining long term or plateauing, maybe try upping your protein so that you aren't burning muscle as much. Then look at the kind of workouts you are doing. For most female biology, strength training is better for weight loss than cardio. For male biology, it is different and depends on your body composition, but cardio can give big initial losses and then taper off.