Provide an ad-free option

Please grant your users the option to elect a low one time fee or minimal cost subscription based AD-Free version of the app.

I'll add to that the suggestion that PRIME members be offered the ad-free version as part of the PRIME membership benefit. 

This sign of good will towards your users would go a long way. Obviously, do it without increasing the annual Prime fee. It's obvious you are exceedingly well monetized. Think of it as "giving back".