I think some therapists do not quite underand that the inner personality of their patients does not always translate into their visible personality (if that makes sense).
To give an example, I cannot be my sociable, dynamic self anymore because of health issues. doctors interpret my behavior wrongly, because they assume I always behaved this way. They do not consider that I am struggling with pain, breathing difficulty, forgetfulness, neurological impairments and fatigue while I engage in a iscussion. It's probably due to lack of time and lack of compassion on the doctors' side.

Going back to you, on one hand it sounds like you may have reached a plateau in your current group. Switching therapists and groups may be useful. Maybe your current therapist can suggest a colleague and perhaps a smaller group. The ideal setting may not exist and you may have to make it work with the therapists available.

On the other hand, there is only so much a therapist can do. It is up to the patient to do the work toward the therapy goal. Irrespective of whether or not you feel misunderstood, you can take lessons from the experience. If it was me, I'd monitor weekly/monthly progress and see what I can do independently to fulfill my goals.
I would not put much thought into considering the picture my therapist has of me. The therapist is just a temporary crutch.