The issue is exactly as I explained above. If I try to open any URL for my domain using either protocol, I am redirected to www.domain.com. This happens on my desktop with 6 different browsers, on laptop and Windows phone with Edge, and Android with various browsers. No change after flushing DNS and clearing caches.
The previous moderator said he had fixed the problem by deleting the .htaccess file and yes, the site could be opened yesterday by clicking in the webhostapp.com link on the cPanel, although, after selecting other pages, it still reverted to the domain.com page.
I see that there is a new .htaccess file in root with identical contents to that originally installed by the WP installation and presume that you placed it there. Today, since that file was installed, I cannot even open the site with the link on the cPanel. I have check the files in the WP directories and deleted the files in the hostinger-page-cache directory, but still the same problems. Are your entries in the .htaccess file and the plug-ins in the mu-plugins directory necessary and mandatory? They seem to be part of the problem.