If you wanted to rescue all your e-books from the Kindle enclave then you should have done it by 2016 when the new version of the Kindle reader made it impossible to break the DRM any more.
Which means to do it now you have to prevent the Kindle app upgrading, uninstall it, find the old 2016 version of the Kindle app, install that, re-download your ebook library, and then import it through a DeDRM program into a libre book-reader app.
And then probably convert it to epub depending what kind of device you might want to read on.
Probably easier to just refuse to buy DRM books in future.
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