A. 1. Implement a notification system that allows users to sign up for alerts when a product is back in stock. This way, customers can be informed immediately when the item they want is available again. 2. Consider adding a 'pre-order' option for popular items that are frequently sold out. This allows customers to reserve the product and ensures they can purchase it once it becomes available.

B. 3. Display stock levels on the product page to inform users how many items are left. This can help manage expectations and encourage quicker purchasing decisions. 4. Create a 'wish list' feature that allows users to save items they are interested in, making it easier for them to check back later.