How can I track cart abandonment by traffic source?

I've been running ads across multiple platforms—Facebook, Google, TikTok—and while my traffic looks good, something's not adding up. My cart abandonment rates seem high, but I can't pinpoint which traffic source is the real problem. I'm spending thousands on ads monthly, and seeing cart adds that never convert feels like watching money literally walk away. Some days, my Facebook ads look great—lots of adds to cart. Other days, Google traffic seems more promising. But without a clear breakdown, I'm essentially throwing budget into a black hole. I need to understand: Are my Instagram fashion ads attracting window shoppers who never intend to buy? Is Google search traffic more serious? Or are my TikTok campaigns bringing in users who are just casually browsing? This isn't just about curiosity—it's about optimizing my ad spend, understanding my audience, and ultimately improving my store's conversion rate. I know the data is out there, but I need a way to track and analyze these cart abandonment patterns across different traffic sources that doesn't require a data science degree.