While I don’t see anything glaringly wrong with your demo, there are other plugins already approved for sale that do the same thing, some with a much more premium design and more features – https://codecanyon.net/category/wordpress?term=woocommerce%20report
Given how many are already approved, it’s unlikely that CodeCanyon will accept any new plugins in this area unless your plugin is exceptional, i.e. it has significantly superior features, quality, and design. Some of your graphs are very thorough compared to the competition, but that clearly wasn’t enough overall to convince the reviewer.
I would take some time to review other plugins, see what you’re missing, put a lot of effort into the UI/UX, and try to get creative with some unique new features. Since it was hard rejected, you’ll need to put in quite a lot of additional work and do some serious revamping to resubmit, so much so that you can consider it a new item.