Hi.
I tried for one of my hosts and domains (susc.ir) to get letsencrypt certificate.
and after many tries, finally the host support changed my host plan from solidcp to plesk.
and the issue gone but this error show up after newly try in plest control panel 
Could not issue a Let’s Encrypt SSL/TLS certificate for susc.ir .
The “Certificates per Registered Domain” rate limit has been exceeded for susc.ir . Let’s Encrypt allows no more than 20 certificates to be issued per registered domain, per week.
See the related Knowledge Base article for details.
Details
Invalid response from https://acme-v01.api.letsencrypt.org/acme/new-cert.
Details:
Type: urn:acme:error:rateLimited
Status: 429
Detail: Error creating new cert :: too many certificates already issued for exact set of domains: susc.ir,www.susc.ir: see https://letsencrypt.org/docs/rate-limits/
how can i refresh my rate ? is it possible ?
its too important for me.
thanks alot.