You have below options after Diploma in electronics and telecommunication
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.
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:
All The Best!!