Hey,
I took a peak and it looks like most of your duplicate content is coming from /tag/ issues in Wordpress. Luckily, this is very easy to solve, especially since you have Yoast SEO plugin in place.
- Log into wordpress admin for your site.
- Click on the Yoast SEO plugin in the left-hand navigation
- Choose "Titles and Meta"
- Choose "Taxonomies"
- Click "noindex, follow" under "Tags"
- Choose "Save Changes"
This will tell Google that your tags pages are useful for categorization and linking but do not contain unique content. Your other alternative is to add content to your tags pages that makes them unique. If you do a good job of creating truly useful tag pages, they can become very important parts of your SEO strategy. You need to be careful, though, so as not to create sprawling, thin-content sections of your site. Here is a decent guide on the practice.
HTH
