My sites are down because Not secured certificate expired

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My domain is: repdom-roots.com
Seychelles.roots.com Inde-roots.com
Sri Lanka-roots.com and few more

Thé certificat expiré , should I renew the same certificate or get a new one to have my site secured and back online . How can I get auto renewal ? The site are all in a mutualize servor with ovh . The other problem is that they are apparently using the same certificat .
What should I do best to secure all the sites ?
Thank you for your answer . My webmaster ask me to delete the ssl getteway certificate ovh and keep only one existing certificate for all . I am not sure this is the right thinks to do
Thank you

I ran this command:

It produced this output:

My web server is (include version):

The operating system my web server runs on is (include version):

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don’t know):

I’m using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot):

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