Research says, 70% of visitors never return to your website. You can get back some of them by sending an email and make them your regular visitors or customers.
I will insert few forms to collect user’s email, name and store them in your email sending server/WP Database, so you can send them an offer email or your new post notification as automated email. In this way, you can back them into your website or you can increase your sales. Also, you can offer them your products or any promotional email to subscribers.