If any post has a total of more than fifteen tags and categories, remove several of those — exceeding that number makes your posts invisible in the WordPress.com Reader. If posts about similar topics are tagged differently, …
I don’t necessarily agree with everything on this blog, but I definitely believe that you have to keep tweaking your blog. Keep it easy to read and navigate, easy to find and looking fresh.
Have a look at your analytic reports and see which blogs people liked, which ones they commented or engaged with, which ones got shared or promoted through your social media links.
Definitely have a read of this blog, which is bound to give you at least one action that will be worth while.