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I don't grow these so I probably won't be much help, but for others who do grow these it would help to know how big the plant is, how much light it's getting, what sort of temperatures does it get, how often are you fertilizing, how much are you watering, etc. All those things can contribute to blooms (or lack thereof) and having a little more info will make it easier for someone to figure out what's going wrong.
I was waiting for an expert to pipe up, but perhaps it's helpful if I tell you what I know. I was given two huge peace lilies in 2002. I am no expert, but I have noticed patterns. One of them is in a corner where there are two windows, one west and one south. It blooms every couple of months. The second gets much less light (west only, with a porch robbing it of some of that light), so it rarely bloomed.
I put a lamp next to the second one (75 watt bulb), and leave it on for a day or two at a time. The growth rate doubled and it bloomed.
I also noticed that they seem to like to go somewhat dormant for a while, so I withhold water, or water minimally (enough to keep them from wilting), then increase the water to a generous level, lightly fertilize (half strength) and then they bloom. I have gotten as many as five flowers at a time.
Again, this is anecdotal but - vary the pattern of watering to fake a brief dormancy, give them lots of light, and if the location is somewhat dark, give them doses of lamp light. And don't overfertize.
I got these when my husband died four years ago. They were in full bloom then but after about 6 months they stopped. They have a lot of new leaves. I've tried super bloom on them, repotted last summer but still no blooms. They are in a west window.
I'm so sorry to hear this because perhaps I understand a little.. My mother was hospitalized a few months before she passed away in 2002, and she was given the two plants I have. When she passed away at the end of that year, I took them as a kind of living reminder of her.
One of my two was in a west window, which didn't seem to be enough light, so I added lamplight. My other plant, which blooms more, has light from the west and south. Having lots of new leaves is a good sign. Can you add a light at a second angle to your plant, or can you rotate it so that the same side is not always exposed to the light? I just read on a website that failure to bloom is often the result of insufficient light.
