Renewing SSL Certificate - non technical

Yes I do. I used Terminal on my Mac to login. I tried using “certbot renew” but it says

“Cert not yet due for renewal
All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/www.veganlabs.com/fullchain.pem (failure)
/etc/letsencrypt/live/snackconscious.com/fullchain.pem (failure)”

I don’t think certbot is installed, also the certificate has expired so does that mean I have to install a new certificate or I can renew it