I bought some lithops plants around three years ago. The rest of the plants are thriving well, however this one appears to have multiple years worth of growth and has been stuck like this for a year or so. I have moved it into its own pot and have not watered it while it has been stunted like this as the lower leaves have not fully dried out. Any ideas how I might bring this back to normal growth? I have been unable to find this problem anywhere online.