This cartoon is brilliant on the whole concept of the spectrum I think @ButterscotchWhip - I've found it really helpful for thinking about and understanding things.
the-art-of-autism.com/understanding-the-spectrum-a-comic-strip-explanation/
There is also a great BBC Podcast called 1800 seconds on autism: if you listen to Jamie (one of the hosts) talking about his experiences you can really understand how the spectrum is not at all a linear thing from "mild" to "severe".
Anybody looking from outside and thinking about a linear spectrum would say our experience with DD is definitely at the "mild" end, if you had to put a label on it, yet she was well over the threshold on the ADOS (even though I thought she aced it
). But so far (we were told she was probably autistic at 3, she was diagnosed at 4 and is now 7) she manages school and friends and life really well without too much upset. I was listening to a podcast earlier though about autistic girls and it pointed out that girls often do "better" (or are less "obviously" autistic) when they are young, and then it can be more apparent when they get older and the more complex social stuff kicks in. That was certainly true for me (I suspect I'm autistic too, though not Dx'd) and I could see that happening for DD. On the bright side, I've had a very happy adult life, found a good professional niche and lovely friendship groups where I fit in and do well, and I really think the same is possible for DD even if there are struggles along the way.
So in the end, I think you have to realise there are going to be highs and lows, and when they are so young (or at any point really) it's pretty impossible to predict what those will be and when they will come. All you can do is try to keep learning about your particular child's unique needs, which will change all through their life, and keep helping them find accommodations (and, as they get older, learn about themselves and hopefully be able to recognise their needs and learn to ask others to help get them met when they need that support).
I've found following autistic adults on YouTube and Twitter incredibly helpful to understanding the range of experiences they have and what worked/didn't work for them as kids, and what they value now as adults. Autistic Not Weird (by Chris Bonnello) is a good place to start. I also really like the Nurturing Neurodiversity website/Facebook/YouTube (although she's not autistic herself). I think she has such a positive and healthy outlook and although he has a lot of challenges her son Dexter is doing really well.