My sons have mixed receptive expressive language disorder.
Ill dive into that, but before i do, a pp said that if a child makes attempts to communicate its not likely autism... This is simply not true, my ds#1 pointed, grunted, and and made attempts to mimic the syllables. He has autism. (they both do)
In my experience op, there is definitely light at the end of the tunnel.
Ill talk about ds#1 as his language probs are more severe..
Ds#1 was non verbal until 3yrs, then spent a year of babbling and not making sense. We started speech therapy at 4, he started school at 5, able to talk.
Now, we of course still have our challenges, his sequencing gets muddled up so he doesnt always make sense, he gets words confused with others, and his comprehension is all over the shop (but thats the receptive language disorder amongst other things) but he talks! And his teachers at school are always surprised when they read his speech reports because he does so well.
We do speech fortnightly per child, and around 1 hours of speech activities per child a day. If u put in the work, u will get the results