To be compliant with GDPR Article 17 (Right to Erasure), Users should be able to request account deletion. This can be done manually, via contacting an administrator, but this would then require the administrator to manually remove the user from the Wikijs instance, as well as make changes in any external authentication strategies(such as Auth0). Having a "Delete account" button would be a bit easier for everyone involved.

From a UI perspective, this could be placed on the bottom of a user's profile.

From a functional perspective, there would need to be some way of allowing code that can hook into the WikiJs account deletion event, and propagate changes to the Authentication Strategy they chose to create their account with.