You have below options after Diploma in electronics and telecommunication

1)Higher Studies

You can do B.E/B.tech (4 years duration) which provides more knowledge related to your branch,grows opportunities for getting good job in terms of post,salary from a reputed company.

2)Go for Job

You can directly do job after diploma if your score is more than 70% along with the deep practical and theoretical knowledge and good communication skills.

Government companies:

BHEL

ISRO

NTPC

CDAC

ECIL

BSNL

Private companies:

LSI Logic

Honeywell

Wipro

Intel

Cisco

TCS

3)Short-term courses

If you feel that any two of the above options are not good for you,then you can go for short-term courses(4-6 months each) like:

1)Embedded Systems

2)VLSI

3)Networking(CCNA)

4)Robotics

5)SCADA Communication

All The Best!!