Deat Aspirant,
Getting admission into a good b Arch institute depends on various factors like no. of students appeared, exam difficulty level, seat availability and previous years cutoff trends.
Since you have a very good rank, you could easily get admission into a college of your preferred choice.
Use our college predictor link given below to view your preferred college available for you,
https://engineering.careers360.com/jee-main-architecture-college-predictor
Also, you can see the previous years cutoff trends of various NITs given below for more details,
https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning Also, you can see the various list of colleges available for you other than NITs given below on basis of NATA and JEE scores,
https://engineering.careers360.com/colleges/list-of-b-arch-colleges-in-india
Hope that helps. Good luck