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Obligatory notes: you are not impacted by crawl budget; this is partly a page authority problem; and also you should avoid blaming downside on core updates, it will always make you look worse (“sorry, I have no control” is not what clients want to hear.)
Okay. Now that that’s out of the way. From what I’m reading (a) you need some hreflang tags on those geo variants asap, (b) it sounds like this is less about algo changes and more about them killing pages or making updates with no consideration to impact and (c) intent-overlapping pages + low authority
What doesn’t really make sense is *every single page falling in the exact same pattern. Seems like there is more there. Is that all traffic? Organic-search attributable only? Are you certain it’s not Bot activity, etc?
You start this investigation by determining if SQL/Pipeline was impacted, and moving backwards to support/optimize pages that drive the most lead flow (read: quality MQL volume)
But in an agency role, I know you might not actually be equipped to do that, so, maybe recommend hreflang tags and give the point of contact a loving kiss on the forehead
