Your customers aren't cheap. You are just making them work too hard to spend more money. Most DTC brands bury their "Frequently Bought Together" or cross-sell sections at the very bottom of the product page. Think about that user journey: You are forcing a warm buyer to scroll past the product description, the ingredients, the shipping details, and the reviews just to find your upsell. Friction kills cross-sells. Move your bundle offer directly ABOVE the main "Add to Cart" button. Make it a simple 1-click checkbox (e.g., "Add the matching serum for 15% off"). Don't make them hunt for complementary products. Remove the friction and capture the impulse.