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I recently came across a great article that might be able to help you out. Ideally, you would want to organize individual content pieces within their appropriate categories to help Google and other search engines easily decide what it is about. I would recommend updating your site structure. Bruce clay talks in depth about how to silo content and I think it will answer alot of your questions.

Hi there. Hreflang must only be used pointing to the same page/article. Not to point to the root/homepage. does it aswer what you've that what you've asked? Best Luck. GR.