What will interest you is a very specific thing for you. So you have to select any part of the Technology and then have to study for it. Many of the subjects are interdisciplinary as well like Mechanical Engineering and Aeronautical/Aerospace Engineering are inter related. So having a unique field is not a appreciable question. You should discover your passion in technology and go for that stream.

Some of the top in demand engineering branch with good future are below:

• Civil Engineering
• Computer Science Engineering
• Aerospace Engineering
• Biotechnology Engineering
• Mechanical Engineering
• Data Science and Machine Learning

There are some of the main branches in engineering which are in demand and the students who are pursuing degrees with good merit in these branches are being recruited by topmost companies with great salary packages.

I hope my answer helps. All the very best for your future endeavors!