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Having one fandom can be isolating.
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Creatively speaking, the canon of your fandom could and probably will provide a very narrow window of exploration. Especially with a fandom that will have no canon material to offer you.
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One fandom means, you’ll often gravitate toward siloed spaces for your fandom or OTP which leads to a very narrow focus and hive thinking which is simply not productive in the long-term.
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Opening yourself up new fandoms and pairings will help you creatively as you’ll be exposed to new ideas constantly from a variety of sources and genres.
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A single fandom/pairing is the road to stagnation as a writer. You’re going to end up writing the same thing over and over again when it comes to tropes and themes. You’ll start a hundred stories you never finish because you’re bored as fuck but you don’t have the creative tools to do anything else because you’ve closed yourself off.
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A single fandom means, your exposure to new authors will be vastly limited and the most inspiring part of fandoms are the authors you find to read and talk to.
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If you have a bad experience with your single fandom, you have nowhere to retreat in order to regroup as a writer or reader within fandom itself which means you may leave entirely (we’ve seen it happen a lot).
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A siloed experience in fandom is the single worst thing you can do to yourself as a writer (and reader) as it means you’re emersed in that fandom for all of its good points and bad. You’ll pick up bad habits as a writer regarding tropes, themes, and grammar and because you have nothing to act as a counterbalance those habits will become ingrained.
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Having several fandoms to move in and out of as a writer (and reader) means you’ll have a broader experience overall when it comes to concepts and themes. You’ll see your favorite tropes explored in different environments with new pairings which can be inspiring and entertaining.
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Writing in multiple fandoms means you’ll have a broader reader base and if audience building is important to you–that’s how you accomplish it. On this, I speak from experience–my website has on average 15k unique visitors a day across several different fandoms. This is a direct result of the fact that I don’t write in a single fandom.