If the temperature was lower than 16°C or if the plant was stressed because of irregular watering (underwatered, then overwatered when repotted), the chances to save it are small.
If I were you I'd take cuttings and put them in wet perlite or wet vermiculite. You can try putting them in water until they grow roots, but be careful to fill the jar less than half to avoid rotting and change the water every 5 days. You can also put the cuttings directly in damp soil, but this method is prone to disease. Don't forget to maintain the polarity of the cutting, meaning that the top part must be kept up and the lower part must be put in perlite, water or soil.
I don't know its exact light requirements, but if you find them out you can check the environment to see if it provides enough by measuring the light with some free phone app. Just search "light meter" on app store.
Please add an update when the situation changes one way or the other so that future users know what to expect. It seems to be a common problem with Dracaena.
EDIT: Watch this video that shows what to do. Even if your plant doesn't have leaves anymore, you can try the cuttings and if it works you'll see that new leaves will appear.
If you feel like it, after removing the top you can cut a part of the woody stem that had no leaves (a few inches portion is ok, the important thing is to have a few nodes). Then you can place this stick in water, soil, vermiculite, etc, as you just did with the top of the branch. The covered nodes will develop roots, while the nodes that are in contact with the air will develop leaves. Don't forget which was the upper part and which was the lower part.
In case the woody stem is hollow or black on the inside it means that this part of the plant is dead and will not come back to life. If this happens, cut until you find firm normal woody stem. The plant is not bothered by the fact you cut it, in fact it will develop new buds to replace what is lost.