What's a possible way to optimize toward a $10 cost per action (CPA) goal if your current CPA is $50?

Setting a $45 CPA and gradually lowering it in $5 increments is the most effective strategy. This approach allows the bidding algorithm to adapt to the new, lower CPA target without drastically reducing reach or performance. A sudden drop from $50 to $10 would likely cause the campaign to stop serving impressions due to an unrealistic bid. Setting the counting method to include only a percentage of post-view clicks would artificially lower the reported CPA, but not the actual cost efficiency. Setting a $10 goal and bidding very high is counterproductive; high bids would increase costs, moving further from the $10 CPA goal. Setting a CPA goal of $60 and incrementally increasing it would move the campaign away from the desired $10 CPA.