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It sounds like your plant has leaf spot. This article will help:
https://www.gardeningknowhow.com/plant-problems/disease/plant-leaf-spots.htm

I would give them some time to see if they recover. Yucca leaves are pretty stiff, almost like the slats of blinds. You may be able to pop them back into shape, so I would give that a try, if you have not done so already.

If they don't recover in a month, then you will most likely have "flat" yuccas for the summer. But the plant will begin to grow new leaves and should be fine for next year.

The following article should be of some helpto you: https://www.gardeningknowhow.com/ornamental/foliage/yucca/propagation-of-yucca-plant.htm

Try giving them some phosphorus. This helps encourage blooming and is a common reason for plants that do not bloom when they should.

This may be a reaction to chemicals in the water, if the plant is being watered from your tap instead of from rainwater. Try setting a pitcher of water out the night before to allow the chemicals to evaporate and then use the water on the plants.

Yuccas typically do not need to be pruned. But if you have overgrown or overcrowding, you can trim them in spring. It will not harm the plant. This article will help as well: https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plants-care-and-pruning-tips-for-pruning-a-yucca.htm