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It’s not a waste of time to finish a first novel, to practice your writing skills with that first novel manuscript, even if it will never be published. But know that the first novel will not be a masterpiece.
While a single skill might have prompted you to begin a novel, begin writing for fun or as a career, that single skill is insufficient for preparing you to write novels. Encouragement for writers to branch out and learn new skills.
Even your most avid fans may hunger for a different protagonist, a different story world, or even a different genre. Consider options for when readers become saturated by elements of your stories.