I've had a snake plant for about a year and its leaves started to curl and droop a couple of months ago (photos attached, the one with the window is where it normally sits). I typically water it every ~3 weeks (haven't changed that habit during the year). We recently repotted it after seeing some drooping in the leaves. We have an AC unit that is about a meter away from the plant that is on most of the day at ~60 Fahrenheit and our window gets fairly direct sunlight (4-5 hours a day).
When I've looked online I've found some sources which say that it's due to over watering, and others that say it's due to under watering. I've found another source which says that it's likely to due to:
How do I save my snake plant?