Yes, You are eligible for joining into 2nd year of B.E or B.Tech of Computer Science , Information Technology or any other related fields of Information Technology as you have completed your diploma in Information Technology through the method of Lateral Entry. You may have to write difference entrance exams ( which changes from state to state) to join good engineering colleges. Check that exam for your state, prepare well for your exam and get admission in the premier educational institutions.
Regarding the Scope of Computer Science, it's Immense. As you know everything is going digital and Everything can be purchased through online / mobile apps / Software's, there won't be any less demand for Skilled Computer Science graduates in near future. But as there are thousands of Computer Science graduates coming out every year, you need to stand out with your talent and skill. Only Degree cannot help you in the outside world. During this B.E/B.Tech, Improve your technical skills, learn new advanced technology and tools , Improve your Communication Skills. If you take the profession as your passion and do all the things above, You will have a great future in the Computer Science field. All The Best.
"Hard work never goes unvalued"