Do you have community pages on your website? Stats show that deindexing these can help boost your rankings. Britney Muller of Moz recently deindexed 75% of Moz’s website the majority of the types of pages were community profile pages.

When searching 'moz.com' in Google search, 56% of the search results were community pages - thousands of pages that needed to deindexed.

Instantly, organic traffic and rankings went up.

Take a read of this article by Kissmetrics to find out other ways you can deindex irrelevant pages that may be hurting your search rankings.