the main reasons to get banned on KDP might be related to Publishing trademarked contents, in this case, you can retrieve your account because you will receive an email from amazon stating the required steps to restore your account, however receiving multiple reports related to that kind of violations will be lead to a permanent ban. all your royalties will be paid to you.

so what you need to focus on is the email you received from amazon support, try to delete or modify any copyrighted or trademarked content ( pictures, quotes,sentences, words...etc).

try to open a support ticket to clarify things directly from the amazon support.