Hello. With your current category rank you may not be able to get admission in top architecture colleges for Bachelors in Architecture or B.Arch. But you still have a chance to improve your percentile by sitting for the April session of jee mains 2019. The best of two attempts will be considered by NTA while making the overall merit list.

You can still use our college predictor to check your chances of getting a good college for architecture.

https://engineering.careers360.com/jee-main-architecture-college-predictor

You can also check the below link for previous years cutoff.

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning/amp

Hope this helps.