"Read Next" Link Two Thirds Into Posts
Adds a "Read next" link to another post from the same category two thirds of the way through each article, keeping readers on your site.
Snippet Library
Content snippets for WordPress
Snippets that add to or change your posts and pages: reading time, author boxes, “last updated” notes, content after the post or after a paragraph, and excerpt tweaks. For bloggers, publishers and anyone who wants richer posts without editing theme files.
Hide the Featured Image on Selected Posts
Adds a "Hide featured image on this post" checkbox to the editor, so a post can keep its image for archives, social shares and related posts but not repeat it at the top of the article.
Related Posts Below Single Posts
Lists three posts from the same categories at the end of each single post. No plugin, no extra database tables.