Rename The Admin.php For Zhang.php

Rename the admin.php file for zhang.php,I forgot clear the template cache,Now I can't access the website, the website cannot be opened,

Web site tips:"Sorry, service is temporarily unavailable."
Am I supposed to do?
thank you!

I have changed it in config.local.php to match the new admin name

Please check step #1

if it does not help, please check the source code of the service unavailable page. Error message should be displayed at the bottom

Probably you have not performed all changes. Try to change back. It should work.