I have recently made fondant cut-outs and I stored them in plastic freezer bags to keep soft - this worked.
idk -- if you have to do them over just fridge them -- I know that works -- what kind of fondant did you use?
Try setting them on dampened paper towels for a while, inside the plastic bags. Check on the often because they could become too soft.
You might also try lightly steaming them and let them stay in the plastic bags to absorb the moisture. Don't know if either of these things will work, but it is worth a try before you have to start all over.
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