Usps — My shipment has been stuck no movement

My order was shipped through USPS, first class shipment, the order was placed on 13th Sep 2021, as the last update it has arrived at the INDIRA GANDHI INTERNATIONAL AIRPORT on the 20th Sep 2021 but since then there has been no movement, nor am I able to contact or track my order, could you please help me as the parcel is a little urgent