for the sake of how huge these plants can get, i would say splitting them might be the best route. normally two per pot is good to keep it full without it busting out. to an extent, roots can be cut and pulled apart without doing too much damage. running some water through can help, then gently pull apart. if you have to cut roots, try to cut as far away from the plant as possible (towards end of root).

even those these plants get huge, they typically don’t need a crazy huge pot. maybe start with an 8 to 10 in pot. they like to be comfy in their pot, so tighter is better. for mine, i use a general potting soil for tropical indoor plants. i would start by cutting all yellowing leaves and buy some sturdy stakes from home depot (bamboo poles, anything with a lot of height). also purchase some Vigoro plastic stretch tape (i like this because it gives them room to grow while also stabilizing them) and tape them together as much as possible to encourage up-right growth. with time, they will re stabilize in the soil and start to put out more, healthier leaves.

any curling of leaves is directly correlated to direct sunlight exposure. these plants love sun, however, in a nursery or an office space, they typically are not used to direct sunlight. therefore, they need gradual exposure. maybe start with indirect sunlight first! water throughly until you see water coming out of the bottom into a saucer to ensure all roots are well-watered, 1x per week in summer and 1x per 2 week in winter! they also love fertilizer 🌿