I would pitch more yeast - my guess is that this was under-pitched or that the yeast was stressed in some way. First, I'd try a couple packets of your favorite dry yeast first. If that doesn't help, the second step would be to get a vigorous starter going, and pitch that. As for taste, if it tastes sweet or unfinished, that's OK. If it tastes infected (sour or phenolic) it may not be salvagable.
Good Luck
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