How to investigate cart and page issues when Amazon ad clicks are normal but conversions drop

Recently, the click-through rate (CTR) for one of my Amazon stores hasn't dropped, and the CPC is stable, but the conversion rate has been declining for three consecutive days. My boss's first reaction was to increase the budget, but looking at the data, I felt something was off: the traffic is still there, so the problem is more likely friction in the PDP or cart process. I first broke down the…