n3k4

To help your WordPress installation be more optimized for search engines, this plugin will include a ‘noindex’ meta tag in the header of any duplicate posts. 
Robots will not index any posts with matching title tags, which is a known indicator of negative SEO. This is very useful for automated posting and working with a large amount of posts.

Noindex Duplicate Posts

This plugin will automatically add a 'Noindex' meta tag to posts that are a duplicate determined by the slug and preexisting post names.

JS Morisset

Extends the WordPress Sitemaps XML:
Improve the WordPress sitemaps XML with article modification times, alternate language URLs, news sitemaps, images sitemaps, video sitemaps (requires WPSSO Core Premium for video details) and more.

Include Alternate Languages:
Include <a href="https://developers.google.com/search/docs/advanced/crawling/localized-versions#sitemap" rel="nofollow ugc">localized pages for Google</a> (ie. alternate language URLs) from PolyLang and WMPL.
Include Images and Videos:
Optionally include images and videos in the WordPress sitemaps XML. Note that video information requires the WPSSO Core Premium plugin for video details.
Include Post Type Archives:
Include missing post type archive pages in WordPress sitemaps (like the WooCommerce shop page and The Events Calendar events page).
Select Post Types and Taxonomies:
Optionally include or exclude post types and taxonomies from the WordPress sitemaps XML.
Exclude Noindex and Redirected URLs:
Exclude noindex and redirected posts, pages, custom post types, taxonomies (categories, tags, etc.), and user profiles pages from the WordPress sitemaps XML.
<h3>WPSSO Core Required</h3>
WPSSO WP Sitemaps XML is an add-on for the <a href="https://wordpress.org/plugins/wpsso/" rel="ugc">WPSSO Core plugin</a>, which creates extensive and complete structured data to present your content at its best for social sites and search results – no matter how URLs are shared, reshared, messaged, posted, embedded, or crawled.

WPSSO WP Sitemaps XML with News, Image, and Video Sitemap

Extend the WordPress sitemaps XML with article modification times, alternate languages, news sitemaps, image sitemaps, and video sitemaps.

Noindex Duplicate Posts vs WPSSO WP Sitemaps XML with News, Image, and Video Sitemap