Hello aspirant,

With a 78 percentile in your jee mains paper 2, there's less chance for you to get a seat into any NITs or SPAs.

You can try for the CFTIs and carefully fill your choice filling for the counselling process of JoSAA. Still it will be difficult for you if you  belong to gen category.

Futher I suggest you to apply for any private B.arch institues too and apply for it if you have also appeared NATA.

Good luck.