How to reduce ACoS without losing sales
The fastest way to lower ACoS is cutting every bid. It is also the fastest way to lose the sales that were funding your business — here is a sequence that avoids that trade-off.
Start with waste, not winners
Before touching bids on keywords that convert, find search terms and placements spending with zero or near-zero orders over the last 30–60 days. Removing that spend lowers ACoS with no sales impact at all, because it wasn't producing sales in the first place. This is what a PPC waste audit is built to surface quickly.
Then separate proven terms from Auto and Broad
Search-term harvesting promotes search terms with real conversion history out of loose Auto/Broad match types into their own exact or phrase keywords. That gives you independent bid control on your best performers instead of one blended bid across dozens of terms.
Trim the middle, don't flatten everything
Rank your keywords by ACoS and spend. The keywords with high spend and high ACoS are your real leverage — small bid reductions there move the account number meaningfully. Keywords with low spend rarely move the needle either way; leave them alone rather than spending review time on them.
Use dayparting before you use blanket cuts
If conversion rate varies meaningfully by hour or day, dayparting can lower effective ACoS by shifting spend toward the hours that convert — without lowering headline bids at all.
Automate the ongoing correction
Once the account is cleaned up, the risk is drifting back to where you started. A "Reduce ACoS" playbook keeps only clear winners and continues trimming waste on an ongoing basis, so this isn't a one-time project.
Run the Reduce ACoS playbook automatically.
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