What KPIs should I monitor daily for cart abandonment?

As a Shopify store owner in the fashion space, cart abandonment is driving me crazy. I'm seeing decent traffic from my Meta ads, but my conversion rate feels like it's stuck in quicksand. Every day, I watch potential customers add items to their cart and then... nothing. They just disappear. I've tried generic discount pop-ups, but they feel spammy and don't seem to convert. My team keeps asking about our funnel metrics, and honestly, I'm tired of guessing. We're spending good money on ads, and each abandoned cart feels like throwing cash out the window. I know our products are great—people are adding them to cart—but something's breaking down in that crucial moment between consideration and purchase. Is it our checkout process? Are our prices not competitive? Are customers getting cold feet? I need a systematic way to understand these drop-offs, not just a vague 'abandonment rate' number. I want to know exactly what's happening, why it's happening, and most importantly, how I can recover these almost-sales and turn them into actual revenue.