Once you have installed an SSL and the site can be reached via https:// properly, you may wish to make it accessible via https:// by default.
Simply put, by typing yourdomainname.com in a web browser, visitors should be redirected to https://yournamedomain.com to access the site securely.
You can force HTTP to HTTPS directly from cPanel, and you can set it up by following the steps below:
Step 1: Access into the cPanel of your web hosting for the domain.
Step 2: Click on “Domains”, located within the DOMAINS section.
Step 3: At the Force, HTTPS Redirect side, switch from Off to On.
You may also refer here for an in-depth guide on how to force HTTP to HTTPS directly from cPanel.