To switch your career to Machine Learning select a domain in which you are interested. List down the top companies in that domain. In LinkedIn, search for the employees working in those companies. Learn about the tools they use in their daily-to-day work in the company. To gain technical skills, I recommend enrolling an online course or attend weekend classes for Machine Learning.
Certification on Machine Learning from reputed institutes really boosts your profile. If you are a working professional, it would be better to register for online courses because of their recorded sessions and self-paced learning.
If you wish to jump-start your career in Machine Learning, then check out this Machine Learning Course by Intellipaat.
You can watch this video on Machine Learning career: