Being a Red Hat guy, I hadn't heard of Debian's sites-enabled, sites-available convention, but I found some more about it here: https://www.control-escape.com/web/configuring-apache2-debian.html

On Red Hat systems, you could keep your VirtualHost config in /etc/httpd/conf.d/com_mysite_www.conf and disable it by changing the name to /etc/httpd/conf.d/com_mysite_www.conf.disabled.  *.conf files in /etc/httpd/conf.d are included by default, as described here: https://www.cyberciti.biz/faq/howto-disable-apache-modules-under-linux-unix/