If a large guest blogging campaign isn't in the cards right now, try reposting your content on Medium. You can even look for a Medium Publication that’s popular in your niche and submit your post to them, in order to reach a larger audience.
There’s also Quora—a question and answer site that lets anyone respond to user’s queries. Search for relevant topics in your niche and then answer questions you've already written about on your blog (like this Quora answer I gave about how to get blog traffic, that's received thousands of views).
Lastly, if you’re more business-oriented in your blog posts, you might want to post them on LinkedIn where that audience spend a lot of their time.