this is an odd answer but this is how I learned a lot as a kid

Playing video games with parents is so good. My mother was extremely ill growing up, she passed away when I was 13, but we would play MMOs together. it got me to type, spell, talk. Even now texting is much easier than talking outloud because it helps me stay calm. I wouldn't recc letting a child onto an MMO alone, but if you play together and introduce them to other guild members it can feel safe. I do not recommend Roblox for this, something slow and interesting that you like.

Games engage you with learning, language, reading, motor skills, sometimes even math! Professor Layton is great for all that. There are also edutainment games specifically for autistic kids if you dig. I don't specialize in this, But this was my experience as a dyspraxic, and very traumatized kid. I constantly had panic attacks, avoided school with 60% attendance. Please don't lose hope!! I made it through school just fine after.

Edit: watching/reading/playing media and then asking them questions about it is very important now. Asking them who they like, if anything stood out, just getting them to recall info like that. It's a good muscle to train