Please get rid of the standard flatsome looks, such as the basic sidebars (without any customization options, take a look at nordstroms sidebars on the category pages they are clean and simple yet they have everything you need for your online store). The category pages or the product summary and product description on the product pages are too basic, again this just does not look good and can only be used if you need a quick webshop, but if you want to customize them it gets a little harder. Also try to make your designs such as banners and full pages in the flatsome studio look more like large webshops such as wayfair, nordstrom, farfetch.com. Also improve the theme's buttons, headers, the MENU very important, plus the footers and many other things, basically everything about the design of the theme, just change it so it looks more like these large online retailers and you will have the best theme out of everyone, garuanteed!

NOTE: I have added some images for inspiration, ofcourse don't copy the designs, try to remake them in your own style.