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Was your plant outside for the summer and you recently brought it in? If so, it may drop some leaves, but should regrow.

Also, the color can fade if the temperature is too low, it isn't getting enough light or needs to be fertilized.

https://www.gardeningknowhow.com/houseplants/ti-plant/growing-hawaiian-ti-plant-indoors.htm

It can be rooted from stem cuttings easily. This article tells how:

https://www.ctahr.hawaii.edu/oc/freepubs/pdf/of-33.pdf

Air layering is possible, but takes longer.

https://www.gardeningknowhow.com/garden-how-to/propagation/layering/air-layering-plants.htm

I think that the issue is that it is rootbound, this plant will tolerate full sun and needs it. I would repot into a container that is about the size of the top canopy of the plant. Keep the soil moist but not wet. They do not like it to dry out at all. This article is for a different cultivar, but all have very similar care.

https://www.gardeningknowhow.com/houseplants/ti-plant/growing-hawaiian-ti-plant-indoors.htm

It likely is a pest like snails or slugs. About an hour after sunset, visit your plant with a flashlight and look for the pest. Ti plants also do not tolerate salt spray, if you are close enough for that. Also, make sure the soil is not getting too wet. Here is more:

https://www.gardeningknowhow.com/houseplants/ti-plant/growing-ti-plants-outdoors.htm

https://www.gardeningknowhow.com/plant-problems/pests/insects/kill-garden-slugs.htm

https://www.gardeningknowhow.com/plant-problems/pests/insects/organic-snail-control.htm

If just the leaves are brown, you can try removing those and new ones may fill in. If not, you can cut it to the ground.

Here is more:

https://www.gardeningknowhow.com/houseplants/ti-plant/growing-ti-plants-outdoors.htm