What specific events should I be tracking to understand cart abandonment?

As a Shopify store owner in the fashion industry, cart abandonment has been my silent revenue killer. Every month, I watch hundreds of potential customers add items to their cart, only to vanish without a trace. My Google Analytics shows a brutal story: out of every 100 visitors who add something to cart, only 20 complete the purchase. That's 80% of potential revenue just... disappearing. I've tried generic pop-ups and discount codes, but they feel spammy and don't address the real problem. I know something is happening between 'add to cart' and 'checkout complete' that I'm not understanding. Are customers getting cold feet? Are there hidden friction points in my checkout process? Are my shipping costs surprising them? I need a forensic-level understanding of what's happening in those critical moments. I want to know exactly which events signal a potential abandonment, so I can create targeted interventions that feel helpful, not pushy. This isn't just about recovering lost sales—it's about understanding my customers' buying psychology and creating a smoother, more intuitive shopping experience.