How many therapists would you go through before deciding that maybe the issue isn't the therapist but just therapy not working?

Hello, I am working on getting a diagnosis but I have been peer reviewed by several autistic people and non autistic people as autistic, I was going to use the suspecting autism tag but it wasn't there when I searched it.

I've gone through about 7 therapists over the years; going to one for awhile, stopping, looking for another therapist, repeat; I read that sometimes talk therapy just doesn't work for autistic people and I'm wondering if that is my issue.

So how many therapists would you try going to before deciding maybe talk therapy isn't going to work for you?