Hey Aspirant, at your percentile your expected rank is about 3200 which is calculated by :

1800*(100-(your percentile))

You have managed to get a considerable rank but you can only manage to get colleges with home state quota as cutoffs for other state students go really low.

For instance, in most of the NITs lowest cutoff for other state students were about 2000 to 2500 while for home state students cutoff was as low as 8000. The data I provided was for the general category.

You must visit the link below for proper information about previous year cutoffs and then you may figure the no. of colleges you may get:

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

Hope it helps.