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These plants are notorious for being temperamental when it comes to flowering. They will readily flower for months and then just stop, with no scientific reason for this behavior. It may have a lack of phosphorus, which helps encourage flowering. Since a little extra phosphorus will not hurt, I would give the plants some phosphorus, like bone meal, just to make sure that all the bases are covered. This article should also help: https://www.gardeningknowhow.com/ornamental/flowers/bop/bird-of-paradise-blooms.htm

If the leaves stay green but curl up, that is a sign of too little light. Try and keep the plant within 5 feet of a window that provides at least 4 hours of direct sunlight a day for best results. Here is more info: https://www.gardeningknowhow.com/ornamental/flowers/bop/bird-of-paradise-as-a-houseplant.htm

These plants are notorious for being tempermental when it comes to flowering. They will readily flower for months and then just stop, with no scientific reason for this behavior. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/bop/bird-of-paradise-blooms.htm The plant could also be suffering from a fungal infection of some kind. Treat the plant with a fungicide and see if this helps at all.

This article might help: https://www.gardeningknowhow.com/ornamental/flowers/bop/leaf-curl-on-bird-of-paradise.htm

This is usually planted in spring after the threat of frost has passed. Once planted, make sure to give it plenty of water so that the roots can establish before the heat of summer comes.

Birds of paradise do that sometime. Their leaves form in a growing tip deep down inside the structure, much like grass and palms. The plant suffered some kind of stress when the leaves were deep in this nursery; it may even have been when you purchased the plant. As more new leaves form, they should be ok. If you start to see brown on the edges and/or tips of the leaves, cut back on the water.