Hello

Yes you can study btech in any of cse or eee after your diploma and affcourse much higher degree will have, much better job opportunities you'll see.

Here I want to tell you job opportunities after diploma in eee---

1. Control and Instrumentation Engineer

2. Electrical Engineering

3. Broadcast Engineering

4. Manufacturing System Engineer

5. System Analyst

6. Electronics Engineer

7. IT Consultant

8. System Developer

9. Network Engineer

Have a look at the top recruiters after Diploma in EEE-

1. BHEL

2. NSPCL

3. Power Grid Corporation of India Ltd.

4. BALCO

5. SAIL

6. NTPC

7. Durgapur Steel Plant

9. Indian Space Research Organization (ISRO)

10. Tata Metallic

11 Tata Motors

12. Tata Steel and Power Plant

And more...

There is no doubt that computer science is the top most priority of the students as the job opportunities are more for computer science. Since everything is becoming digital, the platform for digitalization is increasing exponentially. There will be rise in the job opportunities continuously.
But the other branch is also not bad if you have interest in it then you can easily grab the opportunity in that field too.
And rather than looking for the future scope look for your interest and then choose, as the opportunity can only be grabbed if you put 100% efforts into it.

Hope that helps