What can I do after completing my Diploma? I am in last semester of Diploma in metallurgy branch.

You can go for B.Tech in metallurgy engineering which will help to get good career options and also a good job. Through Diploma also you can get a job but that may be at lower level with less salary package. So, after completing the degree, you can have good options.

You can do BE or B.Tech in metallurgy after completing your diploma.