Adding new pages can help, but it also could hurt you, depending on if you wrote the copy the right way.
I add pages when I see my ranking slipping or moving around a lot, that way Im adding weight to my site, as I know the rest of the site is doing good with the keywords I want.
If the site is slipping on a keyword that I want I will write 3-7 pages 100-250 words of content for that keyword.
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