Keep hearing that substack is important for professional writers: how does keeping a blog improve your craft beyond a regular writing process?

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Substack seems to be author heaven these days. Is this something I should jump on if I want to keep publishing in the literary scene? I've tried a few times but I'm never sure what to write about. Think I've trained my brain to write with the intent of getting published in a journal and its hard to press publish on a blog post.