If it were mine, I would put repot into a bark mix and include a little sphagnum. Leave it in a place with a bit less light and care for it normally until you see new growth...then give it more light. I dont know about how others deal with a change in potting mix, but if a plant of mine isn't obviously suffering, I change in stages. Yours doesn't look so bad off. I'd most likely keep the roots unless there are any dark squishy spots.
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