It should be know that supply and demand play a significant role when Facebook determines CPM. Increased competition for ad space during peak times raises costs. Advertisers often compete for the same audience, driving up CPMs. Second, customer experience affects your CPM. Facebook uses a Customer Feedback Score to evaluate ad relevance. Poor scores can lead to higher costs. Third, the quality of your ad content matters. Low-quality images or broken links can result in higher CPMs. Lastly, targeting a broad audience can also increase costs. Narrowing your focus may help reduce your CPM effectively.