Are shipping costs the main reason people abandon beauty product purchases?

As a beauty and skincare e-commerce store owner, I've been obsessing over cart abandonment rates. Every time I see a potential customer slip away, it feels like money literally vanishing before my eyes. I've watched countless sessions where someone adds a $75 serum to their cart, browses a bit more, and then... nothing. Gone. My analytics show shipping costs are often the culprit, but I'm not entirely convinced they're the sole reason. Sometimes it feels like there's a more complex psychology at play. Is it just about the shipping price, or are customers weighing multiple factors? I've tried various strategies—free shipping thresholds, flat-rate shipping, even absorbing some shipping costs—but nothing seems to create that consistent conversion magic. My team keeps pushing me to understand these abandonment triggers, and shipping is always the first suspect. But I want more than just hunches. I need data-driven insights that can help me transform those almost-sales into actual revenue. What's really going through a customer's mind when they see that final cart total?