I would chop the top off, somewhere above a notch in the stem that has healthy leaves below and under the badly burned leaves.
You’d be surprised at how quickly it will bounce back with new growth when it isn’t spending all its energy trying to keep those dead leaves alive.
NGL it’s scary to think about cutting your beloved plant in half but you can’t recover the burned leaves and pruning will encourage branching and new growth
Your transition to soil rooting sounds careful and is a good method. I agree the wrinkly leaf is slightly concerning, but the new unfurling leaf is a good sign.
Variegated varieties require more light than their non -variegated counter parts. More light requires more water but I would always err on the side of caution because bouncing back from under watering is much easier than recovering from root rot for overwatering. You might consider raising the humidity instead of opting into more water in the soil and you can use a pebble tray under the pot filled with water instead of buying a humidifier. Make sure the bottom of the pot is above the water line in the pebbles.
It’s inevitable that this plant will lose it’s oldest leaves as it makes new, but also consider the possibility of pests and carefully inspect all the leaves for signs.
Water when it gets wrinkly, but don’t let the soil stay saturated forever it can get root rot. Have you seen the roots at all and how long have you had the plant? If it was potted when you got it, underdeveloped or immature roots could also contribute to rot
I’ve been listening to the NTS radio app. It’s a live radio and music broadcasting app that has stations from artists and hosts and DJ’s from over 50 major cities across the world. Free and very cool to hear what’s playing on the other side of the world at any time!
Any kind of pork, beef, or lamb fat. Using it as a replacement for butter or oils to cook or prepare ingredients brings a whole new depth of flavor to a dish!