Hi,
Starting in December 2021, I use the Google's system to show GDPR and CCPA messages (https://www.webmasterworld.com/google_adsense/5053969.htm). And starting also in December 2021, the RPM of my website started to drop month over month.
Most of my web traffic comes from US, and the Impression RPM was last week (10-16/Jul/2023) 57% lower than in week 20-26/Dec/2021. I'm aware that it was Xmas season, but the Impression RPM is now 34% lower than in 11-17/Jul/2022, just one year ago. The RPM trend is downward each month, even in December 2022 with respect to November 2022 and October 2022.
Most of the webpages of my site are quite long, with 5-6 "manual" AdSense units, and "Auto Ads" enabled. I'm not sure if I configured something wrong, or it is just a declining advertisement market, due to the economic uncertainty.
Other KPIs:
- CPC is also declining month-over-month
- CTR is slightly increasing month-over-month
- Active View Viewable is slightly increasing month-over-month, now at 50%
I would appreciate similar experiences, KPIs to be measured or parameters to be tuned, in order to obtain conclussions.