Selling products as business purpose at ease with Magento 2 Quantity Dropdown extension
You can boost your sale by setting quantity value in the quantity dropdown list for customers to order, so that customers have no options except from your fixed quantity. Obviously, with this outstanding feature, you not only have a professional display for quantity box, but increase the ability to sell a large number of products or any your purpose.

Manage your customer groups navigating your site with Magento 2 Customer Approval extension
The plugin helps you to control customer accounts logged in your website instead of the default automatic activation. This is pretty useful when you want to verify the detailed information of customers before giving them access to your Magento 2 site.

Another feature your site should have is navigational buttons
With Magento 2 Previous/Next Product Page extension, customers now can easily navigate previous/next products without coming back to catalog or search result page. Moreover, customers will not have to go back and forth between catalog and product pages many times, which totally saves more time for them and boosts chance of ordering items.