You probably have one more chance. Roots are stimulated by warm, humid conditions. They are damaged by drying out or by wiggling against media.
You could start by using a rooting stimulant. I like Kelpak. But don't wait for this if you don't have any.
I would use barely damp, not wet sphagnum moss in a pot. Tie the plant tightly to a stake so you can insert the stake into the pot and have the rhizome flat at the moss surface, without wiggling. Put the whole thing into an enclosure to keep the humidity very high. You want it very humid but not wet. You could use a large jar, aquarium, terrarium, translucent plastic storage box or vase. You could put it a large plastic bag, but keep the bag from touching the plsnt. Cover or seal the enclosure but not tightly; there should be air exchange.
Put it someplace warm, and in bright light, but with no direct sun. That would cook it. When roots begin forming be very careful not to damage them. Keep the moss barely damp, not wet. When roots are forming begin fertilizing. The plant hasn't taken in nutrients for a long time. I would use either a 20-20-20 type preparation or an MSU preparation. I would use tap water and not pure water to ensure the plant gets calcium.
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