Do you have customers who buy specific products regularly? For example pet food, contact lenses or shampoos? Remind them with the next order before they run out of the products.
Recurring product reminders can be set up using the repeatedly purchased products‘ campaign. Next, configure the campaign name and the time when the campaign should be sent. 
It is necessary to use the automatic block called “Repeated Purchases” in the template. You can find it in the editor under the “E-commerce” category in the list of components.
After clicking on the product block, you can adjust the number of products that will be sent in the campaign.
Save the campaign, and you’re done. The campaign will automatically be sent to customers who have purchased the same product from you at least twice.