Content marketing - blog posts with useful content posted around the Internet. Most traffic from HN and Reddit.
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There are also SEO pages which do not have any useful content. I think I should have more of them because my competitors have only SEO pages but I don’t have time for it as I have to focus on the product and customer support. Probably a good mix between useful content blog posts (maybe with SEO filling) and strictly SEO pages is best to bring traffic.