Let frequent visitors do the out reach for you. Reward them for sharing your website on Social Media and Messaging Apps and for getting new visitors.
Asking your visitors to refer their friends is the best way how to untap new traffic.
Either when a visitor comments on your blog, fills in a form, subscribes to service and/or fills in a form to get access to a special area.
Rewarding those who interact with your WordPress platform via comments.
Identify who your followers are and reward them accordingly.
No need to change your current your theme or user flow. Add a simple webhook and magic will happen.