Hello dear

I am sorry to tell you that at this rank of yours, you won't be able to get any of the NITs or IIITs, even if you have OBC quota. Thus you need to look for other college options. There are vaqrious private institutions in our country that give admission on the basis of JEE mains score. You can go for those, or you can also give other entrance exams as well. Use the college predictor to get a clear idea- https://engineering.careers360.com/jee-main-college-predictor

I hope this helps you. All the best!!