One way of getting search engines to get to your older content a bit easier, thus increasing your WordPress SEO capabilites a LOT, is by using a related posts plugin. These plugins search through your posts database to find posts with the same subject, and add links to these posts.
There are quite a few related posts plugins but we tend to stick with custom code in our theme. A very good alternative is Microkid’s related post plugin, which lets you manually pick related posts. This might cost a bit more time before you hit publish but might very well be worth your while.
There are also a lot of plugins that will automatically link certain keywords to certain posts. We do not like this at all as we find it to look very spammy.
Realisation on snbchf.com
We use the YARP plugin (Yet Another Related Post). I works well even for pages. I often manually update the page and include manually hand-crafted links.
Realisation on newsfeed site
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