You can try to salvage your whipped topping by placing it in the freezer for 5 to 10 minutes and trying to whip it again. But, you most likely had a dud can of coconut cream or there was too much liquid being whipped. If this is the case you could try adding cornstarch (and extra sugar to taste). Neither of these ways are guaranteed to work, sometimes a can of coconut cream simply won’t whip right. In this case, use the backup frosting that’s recommended to have on hand for this recipe.