I need an advise from you, people. I got a ponytail a half a year ago. It was a bit overwatered, infected with mealy bugs and planted too deep into the ground. I replanted it into the cacti soil properly and treated from the bugs. After a while it showed a tiny bit of growth and then nothing. I was thinking it is because of the winter. Been watering it every 3-4 weeks. Now a half a year passed and the top of the trunk started looking as if it is drying out. I decided to take a look at the roots today. I pulled out the plant and noticed that it has not grown a single root in 6m! The ones that it has looks dry and wooden. I cut the very base with knife to see if it is not rotten. It’s firm and white. How do I make it root?? Maybe I need to cut all the old roots or what? I really need some smart advise here. The palm is 5o inch tall and it's "foot" is of the size of kids head.