This works for mine. I have put your site details in.

Make the text below into a .htaccess file and delete the old one. Upload it. That should work.

RewriteEngine On
RewriteCond %{HTTP_HOST} sosd.sk [NC]
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.sosd.sk/$1 [R,L]