How do I delete the local storage?

The (new version of the) app did ask for the private key.

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Android settings > apps > select amethyst > storage > clear data

Exact path could be different depending on your version of Android...

It's recommended to just stick with either using the playstore version, or sticking with the APK sideloaded version. Otherwise you have to clear data and/or completely uninstall every time you switch.