Ecommerce accounts we inherit fall into the same three patterns. Either the entire budget is in Performance Max and the agency tells you 'PMax does it all', or the budget is split across Shopping and PMax with no Search support so the funnel only captures bottom-of-stack intent, or the account looks structurally fine but the Merchant Centre feed is full of disapprovals, missing GTINs, broken images, and category misclassifications that quietly cap your reach.
Feed work is the first 30 days. PMax cleanup and proper asset groups are the next 30. Search and brand protection get rebuilt in parallel. PDP and collection CRO starts in month two and runs continuously. None of this is glamorous, but it is where the lift comes from. Most accounts find 20 to 40 percent recoverable spend in the first quarter, before we even think about scaling.
We optimise for margin context, not gross ROAS. A 5.0 ROAS on low-margin clearance product is worse than a 3.5 ROAS on full-margin core range. We bid accordingly, we structure custom labels accordingly, and we report accordingly. If your accountant cares about gross profit and your ROAS report does not, we have a problem we can fix.