To make a Christmas cactus bloom, you need to provide it with the right conditions. First, make sure it's receiving bright but indirect light for at least six hours a day. Water it regularly and keep the soil moist but not soggy. Feed it with a balanced fertilizer once a month during the growing season. Finally, make sure to provide it with a temperature between 50-75 degrees Fahrenheit. If you provide these conditions, your Christmas cactus should bloom just in time for the holidays!