You may not be aware of the reasons why users abandon their carts. Luckily, with this great solution YITH WooCommerce Recovered Abandoned Cart you will be able to remind your customers what they left and encourage them to come back and complete their purchase.
At first, this plugin will let you create a loyalizing system, and sending coupons or emails to your clients. For unregistered guests, only if they leave their email address during the purchase process, you will have a tool to contact them and send a reminder of what they have in their carts.
Moreover, this plugin will let you automatize the whole process.