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Leave it alone until later in the year to see what else it does. If there are a lot of dead stems, take it out of the pot, remove all dead growth and repot in fresh compost. May/June would be a good time to do this.
I would keep it well watered and out of the wind. Wind can cause it to look worse than it is.
You could try giving it a generous mulch of horse manure, and keep the soil moist with rainwater. Don't cut or divide it yet, even canes that look dead now will quite likely burst back into life when it warms up.
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