Use social media websites like Facebook, Twitter, Youtube (check which one will work for your business, where your audience spends more time) and post regularly useful and meaningful information. If you use Facebook, you can post on different groups that correspond with your business niche. Try to engage your audience with interesting posts that they would like to share and eventually bring you more traffic. Pay attention to the time you post. Check at what time and on which days your main audience is most active and you can schedule your posts according to the information to increase posts' visibility.