How to ask CEO to get more involved across our startup?

Do you have 1-on-1s with your CEO? This might sound weird, but you should treat it like an empathy interview of him where you ask your CEO about the specific tasks that he is working on this week and the most annoying problems he is dealing with related to the product build. Continue to do this and try to come up with ways you could help. Offer to do the grunt work-type tasks. Can you watch recordings of user interviews and take notes about the most commonly asked questions? Can you shadow him while he is doing a monotonous task and then offer to do that task subsequently yourself?Of course, all of this assumes that you can do this stuff on top of getting your regular job done.