wordpress 2013 Blog posts won't display

For the life of me, I cannot get blog posts to display on this page: https://thespringsatmonarchlanding.com/healthque/

I have it set to be the posts page in the reading section. I have installed this plugin: https://github.com/billerickson/display-posts-shortcode/wiki

And still, nothing. This theme has had some customization that I didn’t work on. I just don’t know how to bring back the functionality the customizations took away.