Is an autism diagnosis worth it?

I ask this because of the cost. I am willing to pay for an assessment in the lower end of the high cost range which assessments typical have. However, I want to know what it would do for me, if I already have enough evidence showing I'm autistic? I want a therapist who can help me with struggles relevant to being autistic. But I don't know what an assessment would actually give me? I can see it potentially giving me access to a good therapist who specialises in autism. But can I do that without an assessment?

For those of you who are diagnosed, what has it done for you? Did it make any meaningful difference in your situation?