Popular Topics: Stay updated with new topics or popular topics on other blogs you follow.
Keyword search: Take up a keyword search for the blog posts you are writing. Choose the ones that searched often and have less competition.
Use technology - Social plugins and SEO tools are a great thing to market your blog or a blog post. If you do not know about it, then learn it. It helps you reach out your audience in a better way and also improves the ranking of your blog.