Q.Indoor Papyrus plant
Hello there,
I have a papyrus that I keep as a houseplant. It is about Six feet tall and has about 15 stems. While the newer sprouts are green and seem healthy, the taller stems are yellowing at the tips. We keep the plant roots submerged in water as we were told to do when we acquired it. We have a lot of natural sunlight in our home and have tried placement next to a window and also in an area with less direct sunlight, but we cannot seem to re-green all of the leaves.
What advice can you give us to help make this plant completely green and healthy? Thank you in advance!

I would plant into soil and make sure you have a well draining container. In an indoor setting you cannot recreate a bog setting. The water is likely quite stagnant and may contain bacteria.
These links will help you.
https://www.gardeningknowhow.com/ornamental/foliage/papyrus/papyrus-plants.htm
https://www.gardeningknowhow.com/houseplants/cyperus/cyperus-umbrella-plant.htm