What should I do to make my career in hospitality? I have completed my B.Tech.

Better go for hospitality management. Go for more reference and take further step. All the best

Go for Masters in hospitality management from colleges as per your choice and make your career in it. Check here. https://hospitality.shiksha.com/mba-hospitality-management-colleges-in-india-categorypage-6-84-280-0-0-1-1-2-none-1-0

I don't understand why do you want to shift to a totally different stream.It would be better if you do further courses related to your b.tech.stream. Anyway search Google for institutes offering post graduate diploma courses in hospitality management and apply accordingly. All the best.