The problem is in the WordPress plugin database, because an update is detected for the Team Showcase plugin from themepoints.
If you now use the Team Showcase plugin from cmoreira by Codecanyon, the plugins overwrite each other and the shortcode no longer works.
Simply install the new version of Codecanyon and the plugin will continue to run. No changes are made to the database during the update. I would also deactivate the automatic update for this, in case themepoints makes changes and really touches data.