The world does not need another perfect copy of what already works.

A perfect copy adds nothing except supply. It may be competent and it may even sell, but it costs you the years you spent making it and leaves nothing behind that was only available from you. The world’s shortage is never of good imitations.

Ask what your version of the thing would have that no other version does. If the answer is nothing, that is worth knowing early. Change the project until there is something in it that would be lost if you did not make it.