Hello,
With 31000 as your EWS rank, their are very low chances for you to get into any NITs, IIITs. You may have better chances in state Colleges, and thus can participate in state councelling(try in josaa too).
You can also use our college predictor:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile