WordPress Entrepreneur & Small Business Owner.
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I would also consider a design update as well with "Calls-to-action" that are clear and easy to spot. I love and recommend optin monster (https://optinmonster.com) mainly for A/B testing, multiple types of optin variations from lightboxes, bars at the top/bottom, after post, slide in and my personal favorite is their exit-intent. Exit intent allows you to show a lightbox as the user is leaving to push something one last time.