Amazon will remove the ability to download the ebooks for Kindle at the end of the month. So if you ever close your amazon account, you'll no longer be able to access the books you had bought.
Let's fix that:
1. https://github.com/treetrum/amazon-kindle-bulk-downloader
2. https://calibre-ebook.com/download
3. https://github.com/noDRM/DeDRM_tools/releases
The bit you'll need is the kindle serial (from amazon's site), then you can convert to epub
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