What should I do if cart abandonment rates suddenly increase?

Last week, something weird happened in my Shopify store. Our cart abandonment rate suddenly spiked from around 65% to nearly 82%. I'm running a fashion accessories brand, and we've been consistently converting at a solid rate. But now? It feels like customers are window shopping and then ghosting us. I've checked our ads, landing pages, and product images—nothing seems obviously wrong. I'm seeing visitors add items to cart, but they're not completing purchases. This isn't just frustrating; it's directly impacting our revenue. Our customer acquisition costs are already high, and now we're losing potential sales at the final hurdle. I'm worried this might be a temporary glitch or a sign of a deeper problem with our checkout process. We can't afford to keep bleeding potential revenue, especially with our upcoming holiday season marketing push. I need a strategic, data-driven approach to understand why customers are abandoning their carts and how to bring them back.