Hey there

You can do various courses after completing diploma in mechanical engineering:

• CAD training
• Unigraphics
• Boiler operator training
• PG diploma in tool design
• Radioss training
• Mechatronics and Robotics diploma
• Fire and safety course
• Piping design training

Or after completing diploma in mechanical engineering you can become:

• Mechanical engineer
• Technologist
• Assistant professor
• Engineering training
• Manufacturing manager

For more: https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/colleges/list-of-diploma-in-mechanical-engineering-colleges-in-madhya-pradesh&ved=2ahUKEwiX4Y7Fpqz0AhWxjuYKHTwWC9MQFnoECBgQAQ&usg=AOvVaw0GxCmtSBh7jClvD4XGit9l