pharmablog bear in mind seasonal variation - ad rates have dropped since Black Friday, which affects publishers' epmv across the board: https://adrevenueindex.ezoic.com/.
You mention you haven't made any changes, - we do recommend reviewing our guides and making any optimisations necessary - e.g Take a look at the revenue recommendations presented in your Ezoic dashboard. These recommendations can provide insights into potential optimizations for your ad positions. You can access your dashboard here: https://pubdash.ezoic.com/ezoicads/adpositions/recommendations.
Also check out the guide above on how to use big data analytics for more insights - if you have low user engagement on your site for example you can work more on creating content to improve engagement for users in geos perceived to be high value by advertisers. Ezoic's AI SEO tools can help you out with this - check them out in the NicheIQ menu.