Change the creative. Almost every other lever on Meta is smaller than you think it is, and most of them are no longer yours to pull.
The levers that used to work are gone
Ten years ago you could lower cost per acquisition by finding an audience nobody else had found, or by bidding more cleverly than the person next to you. Both of those are now largely handled by the platform. Broad targeting usually beats hand built interest stacks. Automated bidding usually beats manual.
What is left is the thing the system cannot generate for you, which is what the ad actually says and shows.
That is not a slogan. It is a description of where the remaining variance lives. Two ads, same audience, same budget, same bid, same landing page, can differ by a wide margin in cost per acquisition. The only difference between them is the creative.
The account is only ever as good as the next ad in it
A winning ad has a life. It finds the people who respond to it, it spends, and then it saturates. Cost per acquisition drifts up. This happens to every good ad eventually.
So an account that is not producing new creative is an account whose cost per acquisition only goes one way.
This is why cost per acquisition is a creative production problem more than a media buying problem once the account is set up properly. The media buying keeps you efficient. The creative is what resets the ceiling.
What actually moves the number
In our experience the things that move cost per acquisition, in order:
A different reason to buy. The biggest single lever, and the least used. Most accounts run one argument.
A claim the customer already makes. Pulled from reviews in the words the customer used, rather than the words the brand prefers.
Proof shown rather than stated. A rating and a review count in the picture tends to beat the same numbers in the body copy, where nobody reads them.
Answering the objection early. The reason people do not buy is usually one specific worry. Most accounts never put it in an ad.
What rarely moves it: a new font, a new button color, a tighter crop, a different stock photo of the same idea.
How to find out which
You cannot reason your way to the answer, and neither can we. You find it by running arguments against each other with everything else held constant.
Same photograph, same product, same layout, same button. One headline leads on desire, the other leads on the problem. When one wins, you know exactly what won, because only one thing was different.
The alternative, which is what most accounts do by accident, is to change the image and the headline and the offer at the same time and then guess at which of the three did the work. That produces activity and no learning.
We wrote separately about where the angles come from in the first place.
If you want to see what this looks like on your account, we build the first batch free. We research the market, your customers and your competitors, then make 40+ static ads and test them. You get them in 24 hours.