not quite sure what route you are looking for, but if you are seeking more intervention, I would get him assessed by a speech therapist and an audiologist. It could be a hearing problem, a language problem, or an auditory processing problem (edit - I changed the link here: What is auditory processing disorder?), or it could be nothing and just the way he is.
One of my kids has an inattentive ADHD diagnosis plus auditory processing. he’s had some interventions when he was younger that helped but it can be a struggle in noisy situations. He is inclined towards quieter activities, but more importantly, he frequently advocates for himself where he misses verbal directions.