How Do I Get All My Ecommerce Data Into One Dashboard?

The short answer: connect each data source, Shopify, Amazon, Meta and Google Ads, GA4, through native integrations into a centralized data warehouse, then build one reporting layer on top of that warehouse. You don't want to pull reports from five places and stitch them together by hand. Tools like Trivas do this connection work automatically, so the dashboard updates itself instead of waiting on someone's Tuesday CSV export.