You have a privet, which needs to be outside to survive. If temps in your part of the world are still sub zero ( day and night) you can gradually place it outside , in the sun. If it freezes already, place it in an unheatd room/garage/garden shed where it doesnt freeze. When spring comes outside with it, where it belongs.
Don't repot, there is no need for it.
How often do you water? The moss looks green enough, but ground onthe sides of the pot seems dried out?