Write content to your audience and recommend them to authors and influencers of your industry who you think are doing a good job. Share this content in your social media and make sure to tag them not only for them to see it, but also their audience. It is likely that they will appreciate the shoutout and return the favor. Make sure to schedule these posts to be spread out over time for higher chances of retweets, likes, and thank you notes. Take a look at this guide on how to do this hack.