Figuring this stuff out can be soooo frustrating because birds of paradise can wilt with over and under watering, so you usually gotta just cover all of your bases. Sorry this is gonna be long :/
I would first check to make sure the roots aren’t wet at the bottom of the pot, sometimes they can get root rot from overwatering and that can make the leaves wilt. I would try to water that big guy every 4-5 days or so... that’ll vary depending on how dry your house is but really just enough water so it doesn’t dry out fully but doesn’t get overly soggy.
If you just got it or it was exposed to the cold at all sometimes the plants can go into shock and wilt, but can pop back up with care and regular watering.
The last thing I can think of would be sunlight, I’d keep that window open if you can but otherwise you could think about getting a full spectrum bulb to supplement. They can be kinda ugly if you don’t set it up right but if you’re interested I have an extra one and I also have a light setup... U can text me at 612-695-2915 if you want the grow light stuff or have any more questions I hope your plant perks up!!
Thank you! Great info. Is there a way for me to check the roots without having to take the plant out the pot?
I would try to just feel down into the soil as far as you can and see how moist it is, if it gets wetter as you go down its probably soggy by the roots. Sometimes a ruler can help wedge against the side so you can get deeper down, or poking your finger in a drainage hole.
@Lauren Great idea! Thank you!