Hello Aspirant,

Hope you are doing well, as you've mentioned that your st rank in jee main 2021 is 8780, with this rank you have chances of getting seat in nit based on your category, Wait & try for all rounds of counseling, here are the colleges where you have chances of getting seat through jee mains:

NIT Warangal  -   B.Tech Mechanical Engineering

IIIT,Delhi     -      B.Tech in CSE & AI

MNIT, Jaipur  -   B.Tech Electrical Engineering

NIT Warangal  -  B.Tech Electrical & Electronics Engineering

NIT Jalandhar  -  B.Tech Electrical Engineering

You can also use the JEE Main College predictor tool given below to know your chances of best admission possibilities through JOSSA & State level Government & private colleges.

https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

All the best!

Hope this helps you