Hamish's core advice is that every time you post, the next post should be incrementally better — constantly analyzing what landed, what didn't and how to improve it. He borrows the YouTuber logic: post a video a week and in two years you'll be successful, because by your hundredth video, constantly getting better, there's no way you're not writing top 1% content.
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He says you don't necessarily need to post every day; what's more important is not diluting your content or your thoughts, and posting when you actually have something meaningful to say. His reassurance: "if it's a shit post no one will see it anyways" — the algorithm hides the bad stuff and surfaces the good. For LinkedIn specifically, photos perform better, make sure the hook doesn't get cut off with three dots on a mobile view, and respect the reader so a complete stranger with no context could read and enjoy it.