Don't worry too much. If the plant has been kept too wet for too long, its roots won't be very well developed (or some of them may have rotted). So you have to carefully water it for a while. Never let it dry out, but don't keep it soggy all the time and try to let it dry out between waterings as much as you think you can without causing too much harm. "Droopy" is not too bad, but if you notice that the leaves are losing their gloss, then they may be a little too dry. In that case, sometimes spraying with a mister is sufficient instead of watering, if the medium is still moist. If the plant is droopy
and the medium feels very dry, then by all means water it with distilled or rain water, but then let it dry out until the leaves are droopy again and the medium is just moist, before you water it again. You'll have to be a little vigilant, but that will produce a healthier plant in the long run.
Remember, if the plant was stressed, you will have to be a little careful to acclimate it to several things at the same time: less humidity (it was 100% humidity in its little "death dome"), less constantly wet, and more sun. The plant will adjust just fine if you don't go to extremes to "help" it.
If you go from one extreme to another and wear yourself out from worry, the plant will suffer too.
So just relax a little, make sure it has enough water not to dry up completely so that it doesn't have "an excuse to die," slowly allow it to have more and more sun, don't worry about the humidity (the plant will adapt), and even if some of the leaves around the edge die, that's fine so long as you notice healthy new green growth in the center. That growth will be less "leggy" (less long and weak), more robust and adapted better to your environment.
Post pictures if you can. They may help everyone to help you.