Repot it using fresh potting mix. If you find roots that are soft or mushy, trim them off. Water the new soil so that it is damp, like a sponge that has been wrung out. The following articles discusses care of this plant and how to get it to rebloom. https://www.gardeningknowhow.com/ornamental/flowers/poinsettia/poinsettia-care-how-do-you-take-care-of-poinsettias.htm
Answered on March 15, 2019
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