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If the plant were mine, I'd pull the grass and weeds. Even if you can't get all the roots, hopefully you'll be able to keep the leaves pulled off, and the grass and weeds will die from starvation. Then, I'd trim all the brown and yellowing leaves and old flower stalks. Next to go would be the badly tattered leaves. Don't try to clean the entire plant at once if it's too large of a job. Do it in stages so you don't wear yourself out. The plant didn't get this way overnight, so don't try to correct it in one day.

Once the flower fades, look for the seed pod. The pods will turn brown/tan when mature, or ready for harvesting, and are woody and pointed with large, shiny black seeds inside. These seeds have a woolly orange tuft on them. Carefully open the pods and shake out the seeds onto a papertowel-lined dish and let them dry out. Once dry you can either put them in an envelope or airtight container and store them in a cool, dry place until ready to plant OR plant them. If planting, the seeds should be soaked in water for 24 hrs. beforehand to remove the orange-like seed coat. Please keep in mind that it can take plants three to five years to mature from seeds. This article should also help: https://www.gardeningknowhow.com/ornamental/flowers/bop/propagating-birds-of-paradise.htm

There are several reasons why a plant gets yellow leaves. Typically it is a water or fertilizer issue. Make sure that it is getting the right amount of water and is fertilized (especially with iron) is a first step. This article will help: https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm Also, as far as blooming goes, it may have a lack of phosphorus as well, 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

Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/bop/bird-of-paradise-pruning.htm

I am sorry to hear about your plant. If the stems are still alive, they will regrow their leaves. Prune away any black or brown leaves. These are dead and will not recover but leave anything that is green. I would also give it some phosphorus rich fertilizer to help get it to bloom again. These articles will help you as well: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm, https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm

This article should help with that: https://www.gardeningknowhow.com/ornamental/flowers/bop/bird-of-paradise-blooms.htm