What countries are the people that Search Console says you are getting coming from? - If, for instance a lot are from the UK change you country settings to UK and do a site: search again - I often get great results in SERPS in the Philippines with not a single page anywhere else - I have zero connection to the Philippines at all...
Try visiting places that Google employees hang out - Google tech related Google Groups (yes, they are still a thing) and blogs are good, and chat to them - After a while you get to know the friendly ones and can ask direct questions like this - It can help a lot.....
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