There're some top and suggested Products Recommendations extensions for Magento 2.

1. Magento 2 Recommended Products Extension by Landofcoder

The extension brings amazing shopping experience by recommending them the most relevant products. With Magento 2 Recommended Products extension, you can add and arrange suggestions based on different shopper priorities and display widgets in any pages. Help you boost conversion rates, reduce site abandonment and increase interaction rates.

Link: https://landofcoder.com/magento-2-recommended-products.html/

2. Automatic Related Products for Magento 2 by Aheadworks

Automatic Related Products for Magento 2 allows online merchants to assign related products to several items simultaneously. Related products are assigned in accordance with the rules specified by a merchant. Multiple rules can be applicable to the same related products blocks.

Link: https://ecommerce.aheadworks.com/magento-2-extensions/automatic-related-products

3. Magento 2 Automatic Related Products Extension by Megaplaza

Magento 2 Automatic Related Products is a module which uses sets of conditions and actions as rules to establish relations between displayed products and related items. Its flexibility in generating unlimited rules for each product makes itself an all-round product recommendation tool.

Link: https://www.mageplaza.com/magento-2-automatic-related-products/

Is default Magento 2 stock statuses lack providing enough information to your customers? If yes, you will definitely need stock statuses those clearly speak to customers to inform them in understandable manner. MageComp has come up with Magento 2 Custom Stock Status extension to showcase informative stock status along with custom message to make product page look more informative regarding inventory.
With the extension, you can replace default “Out of Stock” status with expected availability date and time and custom message like “Coming Soon” etc. Immediately after products get back to stock, the message, date and status get changed automatically.

Why choose [url]MageComp’s Magento 2 Custom Stock Status extension[/url]https://magecomp.com/magento-2-custom-stock-status.html:
Replace native custom stock status to display informative stock statuses along with custom message.
Show expected stock availability date and time for out of stock products.
Display pre order date for preorder products.
You can hide expired expected dates.
Along with product pages, show stock status on category page as well.
Show shipping countdown based on order cut-off time.
Exclude holidays and weekends from shipping date.
Set threshold value and show messages like “limited stock” or “hurry up, only 3 available” when quantity gets below threshold value.
Auto update the shipping and availability information based on selected settings from backend.

I like to share one more extensions which can boost your sales see this https://www.mageants.com/pre-order-extension-for-magento-2.html