After ITI you can go for the Diploma course in Civil Engineering in most colleges which allows this. After Diploma in Civil engineering, you can work as Junior engineer and if you wish to go for further education, then you can go for the BTech Civil Engineering lateral entry course in which you will be provided admission directly to the 2nd year of the BTech course.

To know more about Civil Engineering as a career, visit the link below:

https://www.careers360.com/courses/civil-engineering-course

To know more about BTech Lateral Entry visit the link below:

https://engineering.careers360.com/articles/what-btech-lateral-entry-eligibility

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