What I'm *planning* on doing is posting them as-is to my fanfic page with a "overview of the rest of the story" so interested readers aren't left hanging. Pull together my outline and some later scenes I'd worked up, and that way people can at least know where I intended to go with it, even if I don't have it written out in fully polished prose.
I've done that, for wip_amnesty. If nothing else, it assuages any remaining guilt you have about not finishing.
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I've done that, for