Repotter

First off, Aralia are not in need of a lot of water, so the chance that you overwatered is likely.

They are almost too easy to do from cuttings so if you remove all foliage you could use it as you would a cutting. Trim the roots back to where there is no sign of rot.
Put it into a pot of either bonsai soil or aged pine bark. Keep damp and wait for new growth.
I have done this many times, it works.

Good luck, Hector

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