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This article will help you: https://www.gardeningknowhow.com/ornamental/flowers/poinsettia/how-to-make-poinsettia-turn-red-make-a-poinsettia-rebloom.htm

Poinsettia are very cold tender (which is kind of funny when you consider it is a "Christmas" plant). The leaves will die when they are exposed to cold and they can't be revived. It may regrow those leaves, but that will take many months. If you are looking for a pretty poinsettia for the holidays, you will need to go buy a new one.

The poinsettia "flower" is actually not a flower, but the leaves of the plant changing color. They can be either white for red naturally. Here are directions for making them run color: https://www.gardeningknowhow.com/ornamental/flowers/poinsettia/how-to-make-poinsettia-turn-red-make-a-poinsettia-rebloom.htm

It probably is not getting enough water. Sometimes they do not water them well at the store. Soak the pot in a tub of water for an hour or so and then let the water drain away. This will rehydrate the soil to the center of the rootball, which may have been left dry too many times at the store to properly hydrate.

If you give it the care it needs to thrive, it will regrow its leaves, but this could take some time. And when they do regrow, they will be green, and not colored. You have to wait until next year to get the leaves to change color. You also have to weigh if waiting for the leaves to regrow is worth the effort.

If you have not read these articles already, you may find these articles helpful:
https://www.gardeningknowhow.com/ornamental/flowers/poinsettia/poinsettia-care-how-do-you-take-care-of-poinsettias.htm
https://www.gardeningknowhow.com/ornamental/flowers/poinsettia/how-to-make-poinsettia-turn-red-make-a-poinsettia-rebloom.htm