How do I figure out if my shipping costs are the main reason for abandonment?

Look, I've been running my Shopify store for two years now, and shipping costs have been a constant headache. I'm seeing decent traffic and product interest, but something's killing my conversions right before checkout. My gut tells me shipping might be the culprit. Customers seem excited about products, add them to cart, but then... poof! They disappear. When I manually checked my analytics, I noticed a massive drop-off rate just before payment. Sometimes the shipping cost is almost as much as the product itself! It's frustrating because I know my products are solid, but these unexpected fees are likely scaring potential buyers away. I've tried manually tracking this, comparing my cart abandonment rates with industry benchmarks, but I need a more systematic approach. I want to understand exactly how shipping is impacting my conversion rates, identify at what point customers are getting cold feet, and develop a strategy to either adjust my shipping prices or communicate the value more transparently.