Hello. My name is ***** ***** I can help you with your question. There is no problem getting al your media content which was on your old Kindle transferred to a new Kindle. You own the content, and it is kept in your Amazon account.
Login to www.amazon.com using the same email address and the same login password ***** you have used on your Kindle.
Then go to Your Account and scroll down to Digital Content & Devices. The select Manage You Content & Devices.
You will find your content and devices listed there under their respective tabs. Please let me know when you are ready to transfer your content to a new device.