So for me, I'll have been with my current therapist 6 years tomorrow. We've gone through periods where things have seemed sort of stuck and/or in frequent and I thought I needed to leave and see someone else. (The early part of the pandemic also sort of stalled things, as I was just trying to make it through that.)

Maybe in the past year or so, I've been making more progress and we've been having more insights. I think it's because I've let myself share more about things I've been holding back, even though they're uncomfortable and could potentially make my T uncomfortable (one time, he said "we could be uncomfortable together"). So something I'd consider is whether you're holding anything back, whether about your current self, your past, or your relationship with your therapist. Note that one thing I shared led to a rather difficult and painful stretch of therapy, and I wondered whether I'd be able to continue with him. So it's not without risk. But we got through it. Something to consider.

Also, have you told him what you said in your initial post here? It's worth saying what you think you might need from him to see if he has ideas on how to potentially make changes to the therapy to help you.