There are a variety of ways you can tackle this. I prefer using apps or features on websites that are more subtle in their effect but avoid coming off as aggressive and pushy. I've compiled some of my favorite apps and tutorials that will help you accomplish this:
ReConvert Upsell & Cross Sell - Your store's thank you page gives you the perfect retention boosting opportunity! Customers visit the order status page more than once- when receiving default notifications from your store like shipping updates to their email. By optimizing your thank you page & adding upsells or cross sell, you will re-engage customers who just completed a purchase with your store, & catch them when they are most likely to buy or to comply with other requests. This app will help you do exactly that.
I hope this helps! If there is anything else I can help you with, please let me know.