Hopefully your plant will recover. Sometimes you have to wait for roots more than two weeks, one of mine showed new root growth only after about 6 weeks, but it was not in live moss just media free over the water in container with daily misting few times a day. And it was in July- August with temp over 85F inside and RH about 40.

I have a question for you when did you apply keiki paste? I applied on mines on few occasions and all times got new spike.