I have a site with hundreds of SEO pages. Some rank decently, like top 5-10 in Google, most - not so much. Should I focus on writing new content, or updating the existing one?

And more broadly, when do you stop writing new SEO content (if at all) and focus on updating the existing one?

To be clear, about 2/3 of the pages are blog posts and the other 1/3 are various Help pages, Manuals, FAQs, etc.

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