The information provided by you shows that you have achieved good results in JEE MAIN 2020 and congratulations for that. With this result it hopeful that you might get a fair/moderate NIT for mech. Or civil department.(in round 7 or in CSAB special rounds) in EWS Category

Check out this link for cutoffs trends of top branches in NITs

https://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches

For all NITs cutoff trends

https://engineering.careers360.com/articles/jee-main-cutoff-for-top-nits

Also, you can use the college predictor tool for exactly knowing which NITs will be available to you for your rank

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

Hope this helps you

Good Luck !