Actually, I have move my website from siteground to vultr and install cyberpanel so I have tried to issue SSL but it doesn't work and showing HAS SELF-SIGNED SSL Your SSL will expire in 3649 days. And this is why I have tried to issue too many times. so how do I get let's encrypt free ssl?
Without the information in the form you were presented when you created your topic, I am unable to help much in the way of specific details. It seems like you have been able to successfully acquire Let's Encrypt certificates based on your encountering what sounds like the duplicate certificate rate limit. This would indicate that you are facing trouble with installing your Let's Encrypt certificate. To help with that, we would need to know the following:
What ACME client software (e.g. certbot or some type of panel) have you been using to acquire Let's Encrypt certificates?
What webserver software (e.g. apache, nginx, IIS) does the webserver use where you want your Let's Encrypt certificates installed
Do you have root access to the webserver where you want your Let's Encrypt certificates installed?