To reset your Database password on Plesk just follow these super simple steps:

1. Login to your Plesk Panel.
2. Click on ‘Websites & domains’

3. Click on Databases.
4. Click on the tab ‘Users’.
5. Click on the Username.
6. Fill in the old Database username and new password, confirm it and click on ‘Change password’.
   Click on ‘Ok’.

That’s it. You’ve successfully changed the password for your database username.