Is your WordPress site shown as No Secure Connection? Solve this easily forcing any http request to be rewritten using https. Just copy and paste the code below into your .htaccess file exactly as shown.

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
Header always set Content-Security-Policy: upgrade-insecure-requests