Quickly add the verification code of Google Search Console (previously known as Google Webmaster Tools) to your WordPress site and display Clicks, Posistions, CTR and Impressions from the most popular search engine.
Keep the track of your words and improve your website's content using the WordPress Word Count plugin. Check stats, make sure there's no slack and gamify the entire process.
The only plugin I'd recommend for connecting your MailChimp account to WordPress
Track the analytics of your RSS feed, and integrate with WordPress so you can redirect and customize your feeds automatically.