1. Log in to your Plesk panel.
  2. Go to Subscriptions → Select the domain you want to change.
    Note: Once you change your main domain name, all subdomains will be automatically changed under the created main domain.
  1.   Select Hosting & DNS → Hosting.
  1. In the ‘Domain Name‘ field, type your new domain name and save it.
  1.   Once you change your domain name, reissue the SSL certificate for all subdomains under the created main domain.
  2. Select Dashboard SSL/TLS Certificates.
  1. Choose Reissue Certificate
  1. Click the Install button under ‘Install a free basic certificate provided by Let’s Encrypt.
  1.  Enter your email address.
    Select the options according to your needs and choose ‘Get it Free‘ to reissue the certificate.