Hey @Paul D. Johnson46! If you suspect a subscriber has been marked as bounced by accident, and you have their permission for us to reactivate them on your list, please reach out to our team at help@convertkit.com81 (or via the in-app messenger in your account) with their email address and one of our Product Specialists will help take care of that for you :)
We also have more information about bounced subscribers here118!