You introduce an important point that I think the recovery movement sometimes overlooks. As survivors, we are expected to respond with similar results to the same therapies that have had a high impact on others. This group therapy modality you're no longer enjoying has been effective for others. But it may not be as effective for you. Let's explore this idea for a moment.
Therapy can be considered an education of sorts. You are re-learning healthier skills for coping with past trauma, for interpreting your life now, for managing new stressors as they arise in the future. These are vital life skills that we all need to learn. So therapy is our education. But one of the more interesting ideas that's come out of the discipline of education is Howard Gardner's multiple intelligences.
Gardner recognized that our brains have a wide range of thinking skills: mathmatic, spacial, linguistic, interpersonal, kinesthetic... there were seven but now it's been expanded to nine. Like you, I'm not so sure I would respond to that interpersonal mode of therapy for a long time. I'm not suggesting that it lacks value. Simply that the mode had worn out its usefulness for you right now. My greatest therapy of late has been kinesthetic -in a word work. I bust my tail in the yard with the shovel, weeding mowing, cleaning, raking. The work lets me focus outside of myself, provides me with an opportunity to accomplish something I can be proud of, and helps me reduce tension. This is appropriate therapy for me at this point because I am horribly lop-sided. I do not get enough pysical activity. I do not usually get any tangible rewards for my work. So this theraputic mode fills in the gaps and helps me balance my thinking, balance my life.
You may consider suspending your participation in the unfulfilling group and seeking another type of therapy that will be effective for you. To be clear I am not saying give up on therapy. I am merely suggesting a substitution in a theraputic mode that has lots its luster. By engaging in other ways you may find a benefit to your overall healing