Don't think of it as "filler"... you're right, no one wants filler! But you can flesh out areas, and provide background that makes passages more meaningful. That's not filler... it's embellishment!
Actually, if you've got 200 pages of story already, you've already got a full story. There's no law that says it has to be 50,000+ words to qualify as being worth the trouble of writing (or reading). Embellish it where it will help sell the story, but beyond that, consider the story told.
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