You can’t run two versions of your website both HTTP and HTTPS. If you want to use HTTPS, you need to be sure that all resources are loaded via HTTPS as well. Currently, we can’t visit your HTTPS website at all. We see some server error. Here is an article that should help you move your website to HTTPs properly https://www.wpbeginner.com/wp-tutorials/how-to-add-ssl-and-https-in-wordpress/