Do you have some photos of the plants/roots? As you say the cause of limp leaves is usually underwatering or not enough roots, but it's important to know which it is in order to give you specific advice.
If it's underwatered, best course of action is repot it (bark chips are fine) and water more often.
If it's root rot (and assuming there are still a couple functional roots), you can also repot it, water well, and then invert a clear plastic bag over the plant to trap humidity.
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Camille
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