How do I track campaign performance over time?

As a Shopify store owner, I've been struggling to truly understand how my marketing campaigns are performing. Every month, I'm investing significant ad spend across Meta, Google, and email channels, but getting granular insights feels like solving a complex puzzle. I need more than just surface-level metrics like total revenue. I want to know exactly which campaigns are driving real conversions, where customers are dropping off, and how I can incrementally improve my store's performance. Traditional analytics tools give me fragmented data, and I'm tired of piecing together reports from multiple platforms. What I really need is a unified view that shows me not just top-line numbers, but the nuanced journey of how visitors interact with my store—from first click to final purchase. I want to track metrics like product page views, cart additions, checkout initiations, and completed purchases, all while understanding the specific behaviors that lead to successful conversions.