It sounds like whatever you have been doing is making it happy, so I would just continue with that. If it is in a window that is starting to get less light, I would move it to a bright spot so it can get whatever light is happening there. I also usually reduce watering in the winter, but if it has just started a growth spurt, you may want to at least keep up with what it's used to for a while unless you start to see yellowing, etc.