Hello Chenny, you said you acquired the plant 6 to 7 months ago..so that would be around winter time.
Typically, Beaucarnea recurvata, does not need watering during the winter/colder months. It is so drought tolerant. But it would still need as much warmth and light access you can provide. In its preferred habitat, it can easily survive 100F under direct sun, whether dry heat or humid heat, as long as the media is as well draining and gritty as it can.
Looking at the media it was grown in, I would guess it was made that way so it can endure being left dry in stores for longer periods of time while waiting to be sold/purchased. But it is not the best soil for it. Watering it in winter did not help, since the moisture retentiveness of the soil may have easily rotted the roots. It is such a slow growing plant, so in colder environments it is not doing much growing at all, so got to scale back watering. It really likes to get faster drain time and go bone dry before next watering. In most cases, I just water these types of caudex formers/fat stemmed plants thoroughly once a month in winter.
As a reminder for this type of plants, cooler temps and insufficient light in winter while indoors, means less to no watering. It just depends how dry it goes in ones indoor set-up. Of the plants I have, Ponytail palm is one of my favorites, it ably stores water in its fat trunk, so I can always afford not to water it often.
On my side, I can leave this plant outdoors year round since we get milder winters. It endures our light rains in winter. I have repotted it years ago in a shallow but wide mouth container, using cacti mix and adding a lot of pumice and insoluble crushed granite. That way it will take the rains, but still drain out very fast. The coldest it has gotten here often is 30F, but if we do get freeze warnings, I store it indoors to wait out those dangerous freezing temps.On your side, your cold weather is way longer, so indoors it must go in winter to spring but near your sunniest window, ideally a south facing window.
Just to show you how my Ponytail palm media looks like, so you can understand what it means when I say keep it gritty and well draining:
Good luck, hope you can try again.