Calathea Musaica Network drooping and leaves are shrivelling


I was gifted this calathea a week ago, it was very unhappy when I got it but I’ve read that they can bounce back quite quickly when looked after properly. My bedroom is quite dark so I ensured the plant was in a place where it would get indirect light. I watered it once since receiving it, the top layer of soil is starting to dry out but rest is still nice and moist. I also placed the plant next to a humidifier. None of this seems to be helping and the plant remains limp and some leaves are shrivelled and dry. I have made sure to research as much as possible and everything either says it is overwatered or underwatered, however i don’t believe this is the case as the soil proves otherwise.
Please help me fix this plant as its really not looking good.
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Update: I have done everything that was suggested, when I checked the roots they were all perfectly healthy and the soil was evenly moist. I cut back some shrivelled leaves, and also noticed some of the stems were rotting at the bottom so I cut them back too as they were causing the leaves to droop. Instead of only having a few shrivelled leaves, they are all starting to get really bad. I have just watered it this morning, making sure to allow excess to drain out.