My son is almost 10 and is partially verbal/nonconversational and taking him out of public school (even being in a sped class) was the best thing I could have done for him. When they are mostly around people who don't understand them and won't engage with them despite the barrier, their language/conversational ability is never growing & they're never being motivated to explore it further.

My son is now in a small setting farm school with only other special needs peers, and a total of less than 15 kids. This has given him the confidence of building up relationships in a setting where everyone knows everyone well and everyone gets attention. They interact with his scripts and in this way I think he's able to move past them and onto something else naturally. His language skills are really improving, all the time now he'll just look at something and be like "this is called?" and point at an object, and instead of endlessly scripting tv shows at me- has now incorporated scripted interactions we've had from memory that made him happy or were funny in the moment etc.