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It may be lacking phosphorus. I would give the plants some phosphorus, like bone meal. If the foliage looks healthy but there are no blooms, phosphorus is normally the problem. This article should also help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

They may also be overcrowded. If this is the case, simply dig them up and divide the plants, transplanting elsewhere.

Don't cut it. It is most always recommended that you leave the foliage alone. Allow it to die down naturally, as the bulbs need this foliage for energy in order to produce additional bulbs (plants).

The soil may have too much nitrogen. This will cause healthy leaves but no flowers. Add bonemeal to the soil to help add phosphorous and balance it back out.

These are just seedpods. They will not re-bloom.