Exit Intent Popup
Exit-intent popups lets you make one more effort to convert visitors as they’re about to leave your site. By detecting when someone is about to leave, you can show the visitor one final message (in a lightbox popup overlay) to collect their email or make them do a specific action.
As the visitor is already going to leave, you have nothing to loose. So throw a Hail Mary, display a popup, and try to convince them you are worthy of their time. Be creative and offer them value.