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stag horn fern

my stag horn fern has dropped all its green leaves, they didn't turn brown, they just dropped off one by one, usually overnight, I think it dried out too much, or the air humidity was too low, however the stag horn fern next to it (and treated exactly the same) has done just fine?
I've moved the leafless fern into a more humid environment away from direct sunlight but so far -it's nearly three weeks since the last green leaf dropped off, there is no sign of regrowth.
how long should I give it before I call it quits?
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