Regardless of the reason why your money plant became leggy, keep in mind that the problem can never be fixed overnight. As with all things, new growth takes its due time.
Once your money plant has regained enough strength to grow again, you will begin noticing how it is regaining its full shape and getting better. It is also important to remember that money plants tend to grow and recover faster in their growing seasons.
Most money plants are in the growing season from the beginning of spring to early fall. If your plant has fallen ill or become leggier in late fall or winter, it may take considerably more time to grow back than it would during summer or spring.