Hi there,
SSL needs to be set up at your hosting provider.
When your domain was hosted with us, we issued a certificate via Let's Encrypt, but that certificate expired the moment you changed your domain's name servers from us to Bluehost.
There is no way to transfer the SSL certificate we issued to Bluehost and there doesn't exist any credentials that I can give you in this regard. If you still want to use SSL on your domain for your Bluehost site you need to set it up with Bluehost directly.