One good trick is to go into the Performance tab, select a page that's doing well, and see what queries it's showing up for and getting clicks for.
Look for ones that you haven't necessarily addressed directly in the post, then add a section on that topic into the post. Very often (not always, but it usually works well) you can get a nice little increase in traffic over time without doing that much extra work.
An example might be if your page "How to clean your propane grill" was getting a few clicks from a query like "Can you use soap on a grill".... I'm just making this up... But that might be a sign you should add a section on that question and rank even higher for that particular query.