Hi, Marck,Greetings welcome to the Forums.
It is good that you re-potted the plant.
Please explain the plant's current pot situation and environment.
Is the photo showing the plant before or after being re-potted?
Did you cut off the dead, rotting roots before re-potting?
Most importantly, does the pot and soil drain well?
Ponytail Plant (Beaucarnea recurvata), in the Butcher-broom family (Ruscaceae, or Nolinoideae, Asparagaceae), is tolerant of indirect light and bright shade, but consider gradually increasing the light for your plant. Its situation indoors far from a window may be insufficient light. The plant will likely grow better in a brighter situation.
Urn-shaped pots that become narrower above the base are a bad idea for plants. It can become impossible to re-pot them without damaging the plant's rootball. The narrowest part of a planting container should be the base.
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