My fantastic GP has been one of the most helpful people since my diagnosis.
After I spoke to her and passed on my report, she went further and read up all she could about women and autism (I suspect she is on the spectrum herself, she was at the same school as I was, but a few years ahead). When I went to her with a form to apply for a DSA assessment, she knew so much about ASD and asked relevant questions, and recognised things in me that I hadn't really spotted myself, which I was very impressed with.
Getting the diagnosis itself has been the biggest help for me, because I can understand who I am and why I've ended up the person I am.
Good support for me would come in the shape of family (all of them) dropping their assumptions and understanding that I'm not the lazy, unmotivated, attention seeking arse that I suspect they think I am, and actually trying to understand who I am, who my DC are, without the mainstream, crappy, unquestioning opinions that too many people hold about neurodivergence.
Support would be some sort of help with HEing the boys so I have time to recover/wind down, instead of constantly firefighting them and myself and ending up in a near-meltdown state constantly where I fear I may crack up.
Support would mean others involved would have a better understanding of autism, so when I do admit I'm autistic, by way of explaining why I have come across in a way that has set their alarm bells ringing a crap parent alert, they should have some knowledge of it, and understand that laughing and rolling their eyes is not the way to go (CAMHS lady, looking at you here!).
Support would be dh understanding that a week with the boys is massively overloading and stressful, and when I go quiet and zone out at the weekend, it's not because I don't love him, it's because I want to survive this all and be here for everyone as best as I can.
There's some comfort in online socialising with fellow autistics, but even then I feel the pressure to come across right, to be able to say the right thing, and I'm constantly disappointed that I don't really feel that I fit in there either, and still feel quite isolated. I find 1:1 communication much easier, but it's difficult to get to that point for some reason, as I seem to give off vibes (either annoying ones or fuck off ones) that means I very rarely gel with others enough to become friends.
That probably wasn't what you were asking, and I've ended up off on a tangent!