Put a baggie over it and see if that gets it going in a couple of weeks. Provide some artificial light if you don't think it is getting enought light as well. When it gets big enough, start some new plants by leaf cuttings or rhizome cuttings and plant in your favorite mix.

Here is an example of one of mine. It is 'Purple Snow' that was down to a couple of nubs. I put a plastic cup over them to begin with and when it was touching the top of it, I put a larger cup over them, then a glass pot, and finally this tall glass vase.