Dear Aspirant
At first lots of congratulations for your results .
I .According to trends of previous years and this year's JEE MAIN cut off I am afraid to inform you that your chances of getting admission into colleges NITs GFTIs and IITs are almost negative. There might be chance for you if young to SC or ST category. However You can try in state level counselling and private colleges .One thing is important that admission in those above mentioned category entirey depends upon that particular category rank , not the All India rank.
you can check previous years cut off
https://engineering.careers360.com/articles/jee-main-cutoff-for-top-nits
check your chances here
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer some of best private colleges are

Amity School of Engineering, Noida

Amrita Vishwa Vidyapeetham, Coimbatore

Kalinga Institute of Industrial Technology, BhubaneswarBirla Institute of Technology, Mesra

Birla Institute of Technology and Science, Pilani

Walchand College of Engineering, Sangli

Vignan's Foundation for Science Technology and Research, GunturVel Tech Rangarajan Dr Sagunthala R and D Institute of Science and Technology, Chennai

Best Wishes .