I don't know if you've tried this, but there are some aps out there that could be helpful...they have pictures the child can press and the app will say the word for the child for example, which can allow them some verbal ability without them having to be verbal...
I like the picture board too, that is helpful. My son was super late to speak (not autistic just ADHD, DB's son is autistic though) but mine was able to learn some basic signs and communicate that way. We also had all his hearing checked and it was all normal he just didn't want to speak...we also worked with a speech therapist.
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