is this a matter of trying everyday ?
domain vorman.mooo.com
root@vorman:~/lets# ./certbot-auto renew
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Processing /etc/letsencrypt/renewal/vorman.mooo.com.conf
Cert is due for renewal, auto-renewing...
Plugins selected: Authenticator webroot, Installer None
Renewing an existing certificate
Attempting to renew cert (vorman.mooo.com) from /etc/letsencrypt/renewal/vorman.mooo.com.conf produced an unexpected error: urn:ietf:params:acme:error:rateLimited :: There were too many requests of a given type :: Error creating new order :: too many failed authorizations recently: see https://letsencrypt.org/docs/rate-limits/. Skipping.
All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/vorman.mooo.com/fullchain.pem (failure)
All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/vorman.mooo.com/fullchain.pem (failure)
1 renew failure(s), 0 parse failure(s)
strong text