One way that we have been helping him with these skills is by using speech apps to work on expressive language and conversation skills.
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Expressive Language Apps for Kids
This app is more like visual conversation starters for kids. It uses photos and offers conversation prompts based on those photos. You can try the free lite version first.
Simple lessons that explain how conversations work, including identifying a talking partner and identifying conversation goals of oneself and the talking partner. It is really helpful for explaining the hidden rules of conversation.
Describe it To Me
This app is a must have for kids with hyperlexia or autism who are struggling with their expressive speech. It focuses on building expressive speech and vocabulary by examining the function, parts, categories, and more of different items.
Language Lab: Spin & Speak
This app works on conversation skills and social skills with its bright and colorful board game format.
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