I would prefer to use the free SSL. I have no idea which one was originally implemented.
In that case, I would suggest making sure that the free autoSSL is enabled in your AMP. Then, check SSL/TLS Status in cPanel to see if that is the SSL currently in use. If so, it should renew automatically! If not, you would need to remove the current SSL (or wait for it to expire) and then activate the AutoSSL. Reach out to our Support team if you need help making sure that the AutoSSL is enabled.
If it is using our free autoSSL, it should renew automatically. If it has not renewed automatically, you may be dealing with a VPS Cron issue.
If you have purchased your SSL from us, and have set your billing to automatically purchase another SSL when your previous one runs out, it should renew automatically after you are billed for the next year's SSL. If you run into trouble with the billing, you would want to check with our 24/7 Customer Service team.
If you purchased a 3rd party SSL from a company other than InMotion, you will need to purchase and install a new SSL, or pay the installation fee to have us install it for you. Hope that helps!