In e-commerce, traffic alone doesn't mean anything; the important thing is to be able to convert that traffic into sales. Even small design improvements make a big difference in your turnover, given that the drop-off rates are around 70% on the industry average.
First, the price hierarchy read on the product page with clear and large images. Second, a strong and single primary call to action the 'Add to cart' button should be found without hesitation. Third, not to store cargo and return information; surprise costs are the number one reason for abandonment.
The fourth is the possibility of paying guests (non-membership). The fifth is to reduce payment steps and show how much time you have left at each step. The sixth is mobile priority: most sales come from the phone, forms should be designed accordingly.
Seventh, trust elements assessments, secure payment badges, clear communication. Eighth, smart search and filtering; can't buy if the user can't find what they're looking for. Ninth, speed: slow down every second of the conversion.
When I apply these principles to e-commerce and marketplace projects, the feedback I hear most often is the noticeable increase in conversion rate. Good UX is the best marketing budget.