I received an email with the information below, how can I proceed?
On June 1, 2021, you will no longer be able to renew your certificates using ACMEv1. You should upgrade to an ACMEv2 compatible client before then, or certificate issuance will fail. For most people, simply upgrading to the latest version of your existing client will suffice. You can view the client list at: https://letsencrypt.org/docs/client-options/