How do I know if my blog posts are actually helping me rank?

Hi guys,

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I have blog posts (1600+ words each) written about my product. How do I know if they're actually effective in helping me rank? I track my product keywords and their respective product pages are increasing in rank, but I'm not sure if the SEO juice is actually coming from the recent blogs or it's due to other ranking factors. I have not made any improvement to the product description.

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TLDR: Not 100% sure if I should continue blog content investment/effort.