It all starts at cPanel. Log in, and drop down to the Security section.
(You can click on an image to see it in a larger pop-up windows.)
First, click on the SSL/TLS link, then click on "Install and Manage SSL for your site."
Uninstall your certificate:
Go back to the security section and click on SSL/TLS Status.
Click on the Run AutoSSL button:
Note: You do not have to select any domains. The Run AutoSSL function will go through every domain that could/should have a certificate.
You can go back to the SSL/TLS link, and click on "Install and Manage SSL for your site" to verify that all the certificates are installed and active.
Renewals will be completed automatically.