A little more information would help shape the responses you will receive here, but I will try and give you a general answer.
When you say, "related to my tags" - do you mean that "tag" pages (in WordPress presumably?) have been marked as duplicates because they contain the same text content as posts on the site? If so, I have found that it is useful to only show an excerpt of the post content on the tag pages.
Alternately, many people disallow Google from indexing their tag pages, because generally they are not important enough to justify optimization, and they don't need to be included in the index - they often have only duplicate content on them.
If you are indeed using WordPress, any number of SEO plugins will allow you to mark tag pages as "noindex" - I like to use the Yoast SEO plugin.