Hello student!

Following are the options  that you've after your BTECH IN CSE.
1)Job
With everybusiness and organization going digital, the IT sector today is a booming field as compared to other sectors and there is a huge demand of Computer Science Engineers and programmers. You'll sure shot get placed at a good IT company if you're really good at it.

2)Startup
Programming in todays world has been stretched even further into other fields like Mechanical and Electronics and hence, its demands have been increasing. The advent of robotics and Artificial Intelligence too has given a boost to the demand and scope of placements in CSE. If you've got great ideas that can help the people, you can actually make it into reality. Biggest startups today are Software giants.

3)Study
If you've plans to continue studying, you can get a master's degree to bring you more opportunities. You can also consider doing research if you want to get a PHD or are interested in research in general. Good Universities across the world will welcome you if you're really good at what you want to do.

Hope this helps :)
Best of luck!