The offer is doing more work than the ad account

An underperforming account routinely gets diagnosed as a targeting or creative problem, because that's what a media buyer can directly control and improve, and it's routinely, at least partially, actually an offer problem: the price, the guarantee, the bundle, the thing being sold isn't compelling enough for any amount of targeting or creative refinement to fully compensate for.

This is an uncomfortable diagnosis to deliver, because it's outside the scope of what a media buying engagement was hired to fix, and the honest version of the audit still has to name it, because optimizing an ad account endlessly against a weak offer produces incremental gains that a stronger offer would have made unnecessary to chase in the first place.

The signal worth checking before assuming the account itself is the problem: how does this business's offer compare directly against its two or three closest competitors on price, guarantee, and included value, not on brand perception, on the actual concrete terms a comparison shopper would weigh.

A media buyer's job is to make a good offer reach the right people efficiently. It's not to make a mediocre offer perform like a great one through sheer targeting sophistication, and the accounts stuck at a performance plateau despite genuinely competent media management are worth checking against this question before assuming the account itself needs more optimization.