How many times a week do you water?
If you repot that plant into a larger pot, you will increase the water volume, and that will cause problems. If you remove any of the old ancient soil you will damage the tiny delicate roots and that will cause problems. Transplanting can stress that plant.
Questions:
The more nodes per cut the more roots.
The best way is anyway that produces roots fast with least effort.
Both vertical vs horizontal cutting placement in pot will work (I would try both)
