Just some additional information: Bluehost does offer automatic Let’s Encrypt certificate via cPanel AutoSSL (or their control panel). You can follow the below guide to enable it. https://my.bluehost.com/hosting/help/free-ssl
If this is what you did before, that means there might be some issue with renewal, and you can get in touch with Bluehost. (Although they probably will suggest the same steps like @rg305 )