Dear Ceolleague,
In the ease of doing business scenario, my personal suggestion is please do not waste your time in doing any diploma. If you are keen to do any part time BL or LLB then it is different and you are most encouraged to do so. But doing a diploma in labour laws will be of very less usages for your career growth as in future there will be only 4 Labour Codes existing. These labour codes you can have your self reading or attend any open training program where can get deeper knowledge to the level of your practice in Industry. No need to do any diploma.
Future will be bright for DATA SCIENCE or HR ANALYTICS where you can really enroll and learn or you can become IT Recruiter by learning the different hiring tools and techniques which will really boost your career. This is my view based on the emerging scenario.