A conversion campaign has been running for two weeks. The cost per acquisition (CPA) is higher than expected. The advertiser made the interests broader in the prospecting ad group and re-targeted one day ago, but the CPAs continue to remain high. What should the advertiser do to optimize the campaign?
- Wait another two-to-three days to see if it optimizes.
- Pause the prospecting ad group.
- Increase the retargeting ad group’s audience size.
- Pause the retargeting ad group.