Heya Aman, 

Congrats for your score in JEE mains paper 2.

As your CRL rank is 3907 and also have category reservation, you have great chances of procuring a seat in a government college.

You can secure a seat in colleges like MANIT Bhopal, School of planning and architecture Vijaywada, Shri Mata Vaishno Devi University Katra and many more.

For detailed description and further information about cutoff and admission trends, you can check this link. https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning/amp

Or you can use the college predictor tool to predict the best suited colleges for yourself. 

https://engineering.careers360.com/jee-main-architecture-college-predictor?icn=JEE_Main_Paper_2_clgpd&ici=JEE_Main_Paper_2_article_view_sticky