How to make content more and more appealable?

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How to make content more and more appealable? How to make content compelling enough to force the reader to subscribe or to buy?

Know what you are producing. A content which is covered by other writers thousand times isn't going to help you much even though you make completely different and produce it in a very unique way.

Check which content are missing. See which are topics people doesn't have much knowledge about and then build content according to it.