It will be quite difficult for you to get chance in NIT as your rank is not good enough. You should think about getting admission in private colleges if you don't want to drop a year and prepare for JEE Main 2021.

However you have a chance to get a list of prescribed colleges against your rank. You just need to use JEE MAIN COLLEGE PREDICTOR. Click the link below, put necessary information and get result instantly.

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

All the best.