You can bring the hibiscus indoors and put it in a bright window. Keep the soil moist. Not too worry if the leaves yellow and drop. Biggest problem is bugs. Rather than spray them with insecticides a friend gives his a shower once a week. Be sure to spray the undersides of the leaves. Fertilize next March at half the recommended rate. Best Nancy and Happy Yardening.
Cut it back in March when you begin to see new growth. Best Nancy