Increasing talking basically means increasing engagement. You have to ensure your posts are relevant to your audience. Monitor real time events and use favourable ones to cash in on marketing. If your posts are getting likes, shares and comments from your some of your audience, then it increases the likeliness that they will be shown to the rest. So it comes down to how engaging you make your posts. There's no set formula. It's a process of trial and error. You have to see what kind of posts you have been getting the most engagement on. There's only tips like include pictures, have a compelling headline etc.