Ron Rennick

Uses a custom post type to allow editing of the promotion(s). The most recent published promotion post by date is shown below single posts.
Some (CSS tips)http://wpebooks.com/free-plugins/genesis-promotion-box/ for your child theme.
Requires the Genesis Theme Framework.

Genesis Promotion Box

This plugin allows you to add a promotion box after a single post in Genesis.

rsingel

andrewcgg

<a href="http://contextly.com" title="Contextly" rel="nofollow ugc">Contextly</a> is the most powerful and customizable related posts plugin for WordPress. 
Contextly provides related, popular and evergreen post recommendations to help you build a loyal audience by getting readers to read more of your content and come back to your site.
Contextly’s smart recommendations can be shown in modules at the end of posts, in the body of stories and in the WordPress sidebar.
Additionally, Contextly is the only related posts plugin that lets readers subscribe by emails to the topics on your site they care about so they can get notified by email when a new post is published – with no extra work by you.
Our algorithms run on our servers, not yours, so we never slow your site down. You can filter out older posts, non-relevant tags and categories and posts with keywords. You can even choose related links for each story.
We also boost your SEO by making it dead simple to add links in the body of your post to previous stories, and Google crawls our links.
We also send daily, weekly and monthly reports to you that let you and your team know how what’s doing well on your site and how Contextly is performing.
Plus we don’t track your users, so we’re GDPR- and CCPA-compliant.
Contextly comes with a free trial (no credit card required), but operates on a paid subscription basis. You can see our pricing and learn more about what we do on the Contextly website.
<h4>Features</h4>
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Multiple Recommendation Modules – You can give readers multiple chances to go deeper, via the Main Module at the end of a post; a Siderail that shows up next to posts (what WordPress calls the Sidebar) and mid-story recommendation modules (automatic or curated).
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Related Recommendations – Related content gives your readers an opportunity to dive deeply into a topic and is the most effective strategy to get readers to read more. Our related content is actually related, looking deeply at the content of posts, not just tags and categories. These are computed in our data center, not in your database, so you won’t be slowed down. Top webhosts that ban most relate posts plugins recommend us.
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Popular Recommendations – Readers are often interested in your most recent and best content. That is why we make this content available on every page, because every page is the new home page. We use a smart algorithm to identify 10 to 15 popular stories so we keep the popular section varied, no stale top 5 lists here.
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Evergreen Recommendations – Good stories should be read well after they have been showcased on the home page. We identify “oldies but goodies” and let you choose to resurface them to users. This increases the lifetime value of every story you write.
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Advanced Filters – You can exclude content from recommendations by tag, category or url. You can also set time limits on recommendations, either globally or by individual tags and categories.
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Channels Subscriptions – You can let readers subscribe to be notified by email when new stories are published about the topics they care about. This requires no work on your end and you control what the email notifications look like.
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Privacy – Contextly is GDPR and CCPA-compliant. We don’t share your data with anyone and don’t track your readers.
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Wicked-Fast Performance – Contextly does all the hard work on its servers, so we don’t hit your database like most related post plugins do. We host all our files on a fast, global CDN so images load quickly. That means your site stays fast and if you get a lot of traffic, Contextly won’t bring your site down. That’s also why the top WordPress hosting services ban other plugins and recommend Contextly.
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Editorial Control/Curation – We believe high-quality content is the result of a happy marriage between humans and smart algorithms. Our curation tools allow writers and editors to control what related posts show up on a story. We then use that info to make better recommendations for the entire site.
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Responsive Designs – We have multiple designs and image sizes to choose from, and they all look great on mobile and desktops. You can customize their look and feel with a few clicks, while advanced users can customize the CSS.
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Analytics – We send daily, weekly and monthly analytics reports that let you easily see which of your posts are doing well and how engaging they are. You can have these sent to everyone on your team.
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Custom Post Types – If you use custom post types, you can choose which ones to show Contextly recommendations on, and which to keep out.
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Video Recommendations – Our recommendations are not limited to blog posts. We can easily integrate your Youtube channel content. Videos will be displayed where they are most relevant.
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SEO – The best SEO comes from links in the body of stories linking to previous content. We make it super-easy for writers to add these links without having to leave the post to go search in Google.
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Internal Promotional Links – If you have a newsletter or an event you’d like to promote, Contextly makes it dead-simple to include that in the recommendation module. That puts promotions where users will actually see them.
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</ul>
<h3>About Contextly</h3>
Contextly helps publishers build loyal and return audiences. We do that by creating engagement tools that are good for publications, writers and readers. If you have questions, please write us at info@contextly.com.

Contextly Recommends

Build your audience with great related and popular recommendations. Let readers follow topics. Editorial control and machine learning.

Genesis Promotion Box vs Contextly Recommends