What to check before you touch anything
- Check the campaign's status in the interface — an explicit "Bid strategy constrained by target" or "Limited by search volume" flag, paired with spend running well under budget, is a direct sign the problem is the target, not a lack of demand in the niche.
- How far behind is actual daily spend compared to the daily budget you've set? If the campaign consistently spends noticeably less than its budget despite active demand in the niche, that points to a target constraint, not a real lack of traffic.
- What does Impression Share (specifically rank-lost share) show? A persistently high share of lost impressions due to bid/rank, with an otherwise sufficient budget, means the target itself is preventing you from winning auctions.
- What would a "natural" CPA look like without the target constraint? You can roughly estimate it from actual CPC on relevant keywords and typical conversion rate for the group; if that number is noticeably higher than your set target CPA, the target is likely set too low for reality.
- Did the volume drop line up in time with when target CPA was tightened? If volume dropped right when that change happened and hasn't recovered in a reasonable timeframe, that confirms cause and effect rather than coincidence.
Possible approaches
- If the status and the math both confirm the target is the bottleneck, the standard move is to gradually raise target CPA in small steps, watching for the point where the campaign starts consistently spending its budget and hitting the volume you want.
- You can temporarily switch to Maximize Conversions (no target) to see what CPA and volume the system delivers "naturally" — that number becomes a real anchor for how much you actually need to adjust the target, instead of guessing blind.
- Google's Recommendations page will usually flag "increase target CPA" directly, along with an estimate of the expected lift in conversions — worth checking that as a starting reference before changing the target manually.
- If the business genuinely can't raise the target CPA (a hard economic ceiling), the move may not be to change the target at all — instead, accept that volume in this niche is capped given the current economics, and focus on expanding reach some other way (new keywords, new regions, new formats) rather than pushing on the target.
- In some cases, if the low target was a historical holdover (set back when the auction cost less), it's worth recalculating a realistic target CPA from scratch based on current data, rather than nudging an outdated number step by step.