Nicolas Cole says ghostwriters shouldn't chase the most profitable niche. Pick the service you actually enjoy writing: social media posts, short-form video scripts, or sales letters. You'll practice it more, get better faster, and stick with it longer.
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How you decide which service to specialize in, you do not make that decision from a place of what is the best service. They all work. You could do social ghostwriting, you could ghostwrite short-form video scripts, you could ghostwrite long-form video sales letters. All of them work. The question is not which one is the best. The question is which one is the best for you? And the answer to that is whichever one you enjoy doing, because the one that you enjoy doing is the one that you're going to stick with the longest. It's the one you're going to practice most often. It's the one that you're going to do for yourself, which means it's the one you're going to be the most competent at the fastest.