Hi Zeeshan,
Your DCET rank is 7500 and the cutoffs for the colleges you applied to are below your rank, so that’s why you didn’t get a seat in the 1st round.

Yes, there is still a chance to get a seat in the 2nd round if the cutoff goes higher. Cutoffs may increase if some students don’t confirm their seats.

Also, yes, you can add or change colleges in the 3rd round during option entry. So, keep checking the official website and choose colleges with higher cutoffs than your rank for better chances.

Hope it helps!