Answer: These plants need plenty of sun, rich soil that is kept moist but not soggy and high humidity. Wilting is often a sign of underwatering, and a plant that needs to be repotted is often under water stress. Since you have not repotted it in a long time I would suspect that should be done. It is a good idea to repot every year or so (even if it is just to refresh the soil rather thanmove to a larger pot) in order to refresh the soil since it becomes compacted and depleted over time. You should also fertilize regularly when the plant is in active growth using a fertilizer formulated for flowering plants. Another possible explanation is that it would prefer even more light. If possible, set it outside for the summer so it can benefit from the sunny days, being sure to acclimate it slowly to the brighter conditions. The plant needs to be in active growth in order to flower. You can trim it back in late winter (this delays flowering), or you can selectively remove individual branches throughout the year.
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