WooCommerce product images can take up a lot of space on your server. One solution would be to host the images on an external cloud and have them used in the templates for the single product page and the product list. Below is a possible solution to do this.
The snippet that allow you to configure a list of WooCommerce coupon codes and specify a list of weekday that the coupon is usable.
Display, in administration product page, a custom meta filed for the product cost price.
Add a custom top bar with custom message to the Wordpress website. You can customize the message via localization and you can decide on what pages or posts the top bar will appear.