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PHP 7.3 reaches end of support in December 2021 and Adobe Commerce 2.3.x reaches end of support in April 2022. You may want to consider planning your upgrade now to Adobe Commerce 2.4.x and PHP 7.4.x to help maintain PCI compliance.

ScalableInventory

Magento\ScalableInventory module provides ability for system extension (CatalogInventory can be configured to work with separate quantity storage). Extraction of quantity updates to separate storage will guarantee better scalability for Magento, and will allow main server to be optimised for read operations which will reduce latency.