How do I “Break Up” with my current therapist?

Hello everyone! I was just recently diagnosed with ASD and it’s put a lot of things into perspective for me. Namely, my therapist is… not the right fit for me. He’s a bit older, like mid to late 60’s, not OLD just older but it’s pretty clear that he has an outdated view of autism, and doesn’t fully understand how it presents in women. When I first brought up that I felt I might be autistic, I was outright dismissed with the “everyone’s a little bit autistic” speech, which is both untrue and definitely contributed to my imposter syndrome before my diagnosis.

Even the things he CLAIMS to specialize in aren’t really helping me. His go-to response to my body image concerns related to my past ED is “you LOOK healthy” which… doesn’t help. I see him every 2-3 weeks but because of some scheduling issues and illness I haven’t seen him in like a month and haven’t even TOLD him that I was seeking an autism diagnosis.

I’ve known it’s time to seek out a new therapist for a while, but this diagnosis has really cemented that. Even the telehealth aspect, where I instinctively watch myself in the mini view and mask much more than I let myself be vulnerable. It’s gotten to a point where I feel like I’m his chit-chat buddy rather than his client. I definitely want to consider therapy through the group that diagnosed me (I went through prosper health with Dr. Morgan Levy and she was amazing)

Despite this I still feel extremely guilty for not wanting to do therapy with him anymore. I’ve been with him for nearly four years now, and while I know logically that our relationship should be strictly patient-provider, I can’t help but treat him as a friend that I’m about to ghost.

TLDR: How can I word this break up text to my therapist in a way that’s still kind and won’t hurt his feelings??? thanks y’all and happy holidays