Allows you to bulk download all your Kindle eBook in a more automated fashion. This tool allows you to create backup copies of the books you've already purchased. - treetrum/amazon-kindle-bulk-...
I can confirm Method 2A works. The actual conversion to epub is automated, but I did have to clean up the metadata for many of my books, but that’s understandable.
One of the tools. Some other options in this very helpful guide (especially if you don’t have a pre-2024 Kindle ereader):
https://www.mobileread.com/forums/showthread.php?t=361503
I can confirm Method 2A works. The actual conversion to epub is automated, but I did have to clean up the metadata for many of my books, but that’s understandable.