My mother-in-law has a real knack for getting her Phalaenopsis (also called Moth Orchid) to rebloom. All of her plants were gifts, and if the plant is in an orchid media (not sphagnum moss) she does not repot them. After they finish blooming, she moves them to a window with bright–but not direct–light and grows them on a tray of rock. When she waters them, she puts them in a sink of water and lets them soak for about 30 minutes weekly. This time of the year, you can see the new bloom stalks emerging. A great friend of mine told me when you see the bloom stalks, it is a good time to fertilize them, and this will promote bigger blooms. Professionals might get plants to rebloom differently, and I welcome their comments, but this has worked for her for many years.