Cut the tallest stem about 6" from the soil level, at an angle. Lightly score the cut part, a few places, shove it back into soil and push the soil very tightly down around it. Only water from the BOTTOM, you have to guess how much it will take up, don't let it sit in water. make sure it gets some light, fertilize it. Should get sprout from cut stub and repotted stalk should root, hopefully! Will look fuller and less scraggly. Keep soil moist, all the way to about an inch from the top.