I think it's better to create a blog first and then create the membership site after you've gotten the "Expert" status. Think about it: would Yaro's Blog Mastermind would have been so successful if he didn't have entrepreneurs-journey.com? I don't think so.
So first start a blog then when you you acquire the "Expert" status in that niche and if you think that there's potential for a membership site in that niche then only start a membership site.
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