The 10 best performing A/B tests of September 1. Return policy in cart + phone number 2. Return policy and 2-3 other key USPS at checkout. 3. Upsells on cart + checkout using Rebuy or aftersell 4. discount ladders on cart (free shipping, freebie, discount %) 5. Adding shipping protection for 3% of order value. 6. asking customers to upgrade to express shipping for cost of shipping + 20% 7. adding split-payment info on PDP, CART + a banner with how it works on checkout. 8. sorting by best seller on cat pages, but making sure you got best sellers of every sub category at the top. 9. adding category "clouds" to every cat page. 10. adding the 3 most popular filters as suggestions at the top of cat pages.