Hi Kelly,
I didn't see Yoast on your site and not sure if you are using another plugin to help manage SEO issues. Yoast is pretty well respected and the plugin can help manage some of the duplicate content issues in Word Press. (tags, categories)
https://yoast.com/wordpress/plugins/seo/
Also some good reads on the Yoast site on optimizing a Word Press site. HTML5 and Schema should also be considered. There are some Word Press Gurus around here and hopefully they will chime in.
Best!