The droopiness of your Christmas cactus could be due to a number of reasons. It could be that the plant is not getting enough light or that it is too hot or too cold in the room it is in. It could also be that the soil is too dry or too wet. Another possibility is that the plant is not getting enough fertilizer. Try to make sure your plant is getting enough light and water, and that the soil is not too dry or too wet. You may also want to consider adding some fertilizer to the soil.