I suggest a smart web push notification service that automatically sends personalized push notifications to the shop visitors, whether they have added anything to the card or they only surfed the shop and left it without adding anything to the cart, but it seems they are interested in some products.
That is very useful and fantastic because it can manage discounts, too! It only sends the minimum discount possible to price-sensitive users and can drive more sales.
It is BestPush.
Check it out here:
I suggest you test it because it is Free up to 500 notification subscribers (that is, for several months)and all its features are available in this free plan.
hope you find it helpful :)