Unfortunately, I change my wp-content from cpanel.

rename .htaccess to htaccess.bak and use the basic WP .htaccess file:

https://codex.www.ads-software.com/htaccess#Basic_WP

What files are in public_html?

You should have these

.htaccess
index.php
license.txt
readme.html
wp-activate.php
wp-admin (directory)
wp-blog-header.php
wp-comments-post.php
wp-config.php
wp-config-sample.php
wp-content  (directory)
wp-cron.php
wp-includes  (directory)
wp-links-opml.php
wp-load.php
wp-login.php
wp-mail.php
wp-settings.php
wp-signup.php
wp-trackback.php
xmlrpc.php

My suggestion is that you start with fresh installation.Follow simple steps :

1. Download wp-config.php file
2. Now for safety backup the database and don’t delete it.
3. Download the Wp-content folder
4. Download WordPress from – https://www.ads-software.com/download/
5. Upload it and unzip the folder
6. Delete “Wp-content” and “Wp-config.php” and replace the old file that you downloaded

Note: It will work fine.You don’t need to link database as it is already linked.

I have all files and I change a name of a .htaccess file to htaccess.bak file. I also use the basic WP .htaccess file. I think I should wait for some time and then I try again. I hope It will work. Thank you for your time and concentration.

Thank you #Intaj. I’ll do it same.

Waiting will not change anything. It will work or it won’t.

Do you have a backup from before you made this change? If so, it might just be best to roll things back.

Yes, I made a backup of my database only before I made changes. Now, what should I do?