Thanks for the help.
Apparently the WordPress site was hacked… I found 2 FTP files that Kecker was trying to use to increase the FTP quota in the root folder, which I deleted. I also changed all wordpress files except “wp-content” folder.
Right now, except the homepage, other pages of the site are loading. Every time I try to access the homepage, I get the error, “This page isn’t working… redirected you too many times. Try clearing your cookies. ERR_TOO_MANY_REDIRECTS.”
1- I cleared browser history several times, set it to “All Time”.
2- I ran WordPress folders and files permissions via ssh to make sure it is not a folder and file permission issue.
3- I ran a database repair via SSH, which was completed successfully.
4- I disabled all plugins
5- Clean .htaccess file
But, when I tried to use wordpress repair tool, I get the error message saying “define(‘WP_ALLOW_REPAIR’, true);” have to add. In the “wp-config.php” file, which I have already added before trying to run the URL, for example, “https://mydomainname.com/wp-admin/maint/repair.php”. At this point, I see that wordpress is not able to read the “wp-config.php” file, so when I try to call the repair line from the “wp-config.php” file I also get that error are getting. ,