Hello Chaitanya, with 4500 rank and if you still havent got any seat through 1st round CSAB counselling, you might not get into NIT delhi, trichy. However you can still stay hopefull for other NITs like NIT jalandhar, NIT agartala, NIT silchar, NIT srinagar,etc.

Also feel free to use this college predictor to be assured of which college you might have a chance of getting into

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