Well, there aren't any tricks to it really. Its all just good common sense digital marketing. You could tag other pages or super fans in the post hoping they like it and share it. You can cross the post in your blog. Of course, posting a link to your Google+ account is just good SEO. But probably the best way to reach more people without boosting or using paid ads is to just post great content that is relevant to your audience. If they love it, then they're more likely to engage and share.