I've been having trouble with my sansevieria for the past few months. I repotted it a week or two ago and, as I did, examined the roots, which were brittle--I believe the soil it was in (I don't remember what it was, but I got it at a hardware store) was suffocating the roots. I repotted it in cactus soil. Before repotting, some of the leaves were shriveling/wrinkly and/or twisting, and a few of the taller leaves were falling over, which someone had suggested to me was natural because of the height. I cut the falling leaves to propagate. However, even after repotting, many of the older leaves (darker in the photos) are falling and/or still shriveling/wrinkly. Yesterday when I went to check the soil to water, I discovered this browned/curled leaf and others near it that looked like they were about to start browning/curling in. Do you have any thoughts about how I should approach nursing this plant back to health? (including photos of some of the roots from repotting as well as the browned leaf and a shot of the whole plant--you'll see I've leaned some of the leaves against the wall.) Thanks in advance for your guidance!