eHost doesn’t appear to support Let’s Encrypt natively.
While it is possible to obtain a certificate manually and upload it to your webhost’s control panel, we don’t recommend this unless you Know What You Are Doing™ as it is complicated and requires your attention every 2-3 months. This can be accomplished with certbot’s manual mode or a website like https://zerossl.com.
Consider switching to a host that does support Let’s Encrypt or purchasing a certificate from a commercial certificate authority instead.