Google's Q4 2022 advertising revenue was $59 billion, but how much of that is being used effectively? Experts suggest focusing on cost per acquisition (CPA) instead of cost per click (CPC), as tracking CPA can provide insights into the actual cost of acquiring new customers. Scheduling ads according to both audience and product can also optimize campaigns by avoiding low-quality clicks. Split testing different ad creatives, headlines, target audiences, messages, and formats can help improve ROI. Additionally, focusing on Quality Score, which affects display and CPC, is crucial for improving ad performance. Running retargeting campaigns can also increase conversion rates, and automating ad workflows can free up time to focus on creative aspects of advertising.