Many times it may happen that the shoppers might have abandoned the eCommerce store because of the unavailability of products or they are forced to sell outdated products for a very less percentage of what they actually cost. This indicates a sign of poor stock management!
To avoid this situation, Magento 2 store owners are always looking for ways that help reduce abandon cart. The only solution is to let customers subscribe to the out of stock products and get notified when the product is available.
It is even possible to enable “notify me when back in stock” for Magento 2 using default Magento stores such as Magento Open Source and Commerce Edition. The feature is available for registered customers and can provide notifications for any changes in price and in-stock alert. Here, in this guide I have mentioned the steps to enable “notify me when back in stock” for Magento 2.
You can refer the tutorial to get more information: https://meetanshi.com/blog/enable-notify-me-when-back-in-stock-for-magento-2/