How to Fix Briefly Unavailable for Scheduled Maintenance Error in wordpress?

1. Fix Maintenance Mode Using cPanel

First of all log in to your web hosting's cPanel and go to the root folder. Find the “.maintenance” file here and delete it.

If you can't find the ".maintenance" file in the root folder, check the show hidden files option. It allows you to view hidden files in the root folder.

2. Fix Maintenance Mode Using FTP

First, connect your site with an FTP client and delete the .maintenance file from the root folder. If you can't see the .maintenance file, click on Server >> Force showing hidden files in the menu bar. This option helps you to see hidden files.

Once you delete the file, your site will go live. Also, clear the cache of your WordPress site.