it may be beneficial For you to try and get a couple cuttings. If there are still any healthy branches. If it has root rot, the chances of it recovering are slim. The only way to really know is to take it completely out of the pot and wash the roots off completely. See what is brown or mushy, and remove it. If the stem is mushy, you will have to try and find sections of it that are healthy and start the rooting process.
