Nearly all monster stories depend for their success on Jack killing the Giant Beowulf or St. George slaying the Dragon Harry Potter triumphing over the basilisk. That is their inner grammar and the whole shape of the story leads towards it.
Do something you really like and hopefully it pays the rent. As far as I'm concerned that's success.
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I think you can have moderate success by copying something else but if you really want to knock it out of the park you have to do something different and take chances.