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In these blog posts you can link to your homepage using the anchor texts that include the targeted keywords. This is known as internal linking and is also one of the many ranking factors.

I think Andy is on the right track, with the caveat that Google needs a little help in the general meaning department. So, one easy way to do that is use Moz's on-page grader for whatever term you've selected... that best describes the page and is hopefully not too difficult and has a little traffic.Just to make sure Google has enough clues as to what this page is about. Over time, you will find that the page hopefully gives you traffic for all kinds of related terms... not just the one you graded against.  Like everyone else, I have pages with top terms that supposedly are good for no estimated traffic, yet dozens of terms contribute hundreds or thousands of visits because they're all in the same general neighborhood. Plurals and what not don't change the general meaning which you have helped Google fully perceive without getting spammy.