If you decide to abandon Locus Map for whatever reason, and you need to delete your user account and all associated data, please ask for the account deletion. You can do so in your user profile in the Android and iOS apps or on the web:
Main menu > User profile > Manage account > Delete account
Main menu > User profile > Edit profile > Delete account
Visit web.locusmap.app > User profile > Manage account > Delete account

The deletion request is protected with a tripple confirmation so you can't do it by accident:
After your deletion request is received, the process of deleting your Locus account and all associated data is started within 7 days:
As this process is very complex and engages several services, it can take a few workdays to complete.