Hello rage1872, ideally, I would change the media you have now and add more pumice to it as Stush mentioned. Carefully unpot and see the condition of the roots and parts below soil line, if it shows squishy below soil line, you may have to cut them off and allow that part to callus. You can dab some cinnamon as fungicide, set it aside. The same on the top part, I see on the photo, on the left side, there is a very yellowed branch, and you can see the portion connected to the main plant already has a somewhat callused part, you cut from that callused part to remove the already yellow branch.
After it has callused, you can repot in new gritty soil mix in a smaller container with drain holes for now. Position in bright, dry and warm area, to allow new roots to form. It may take some time, and it really depends too how far along any prior internal damage has run. But don't lose hope, at times it does require a lot of patience and discipline not to water yet, to assure chances of survival for it.
