Hello,
This KB Helps you how to fix the connection not secure error on your domain (How to install Free SSL Letencrypt over AutoSSL) 

Login to your cPanel > SSL/TLS Status  > Run AutoSSL

It will install the Free SSL from Letsencrypt.

Please allow some time as it need to verify your DNS and other settings before the installation

Make sure your domain has been pointed to our Server IP/Nameservers/DNS so it will install the SSL.

Regards

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