Unfortunately because it's linked to the wrong username, I'm not sure it'll be possible to change - there's a relink process that can be done if it isn't already linked, but I'm not sure there's a way to change the link if it is already linked to a username. That having been said, I'm doubling the disk space now that the Drupal redirect is in place; this should help alleviate the issue with updating Drupal, and with uploading more content in the future.