Your Google ROAS is a lie, and it's costing you thousands a month. But it only takes 5 minutes to fix...
Every brand should be running a search campaign for their brand name (stops competition from taking your paid traffic from meta).
Then you should also have a PMax campaign which is targeting top of funnel traffic. Can be search terms such as "how do I [INSERT DESIRE]".
This is where the issue happens. Google's campaigns try to get you the best results possible. Where do the best results come from? Bottom of funnel. So what happens is your PMax starts favouring branded search terms.
Now, not only are you paying 2 CPA's (meta's and Google's), but you also have your 2 campaigns bidding against themselves, raising your CPC.
How do you fix this? Simple. Go to Campaign -> insights and reports -> search terms and export last 14 days. Do the same for the other campaign.
Upload both into claude and "say create a negative list for my pmax campaign so it acts top of funnel while my search remains bottom of funnel"
Now go to Tools -> Exclusion lists -> create new negative word list -> paste in the keywords claude gave you
Then go onto each PMax campaign -> Audiences, keywords.... -> keywords -> Use negative list -> Select your new list
Then lower the budgets a bit on your PMax's, maybe by 50%, and slowly increase them if the performance is good. Because you have a real CPA now. Not a fake one.
Your old CPA wasn't including what you paid on Meta. So if you paid $30 on Meta and then google was $20, your actual CPA is $50.
And now you have isolated any retargetting to your search campaign, and the ROAS will/should be really high on it, but that doesn't mean you should scale it, as it is just mostly traffic from Meta.
If your PMax performance is good, scale this hard as it should be colder traffic. Keep an eye on the search terms and make sure this is the case.