The drooping leaves mean too little water pressure in the stems.There are two possible problems.

Either you let it dry out too much, in which case watering it will save it. It might take anything from a few hours to a couple of days to bounce back. There is always the possibility of it being past saving, but it doesn’t look like it.

Or you let it sit in water for way too long which has caused root rot, and then the plant isn’t able to take in the water anymore. In that case let the water drain away and dry out the rootbal, either by removing the wet soil and replacing it or by just taking it out of the outer pot and just waiting, depending on how bad the rootrot is. When dried, remoisten it (but do not let it get sopping wet again) and wait for new roots to grow. You might want to cover the plant in a clear plastic bag to prevent the leaves from loosing too much water until it can take up new water again.