In this video

After the loose fiber has been re-positioned as much as possible with the awl, apply a small, controlled amount of carpet glue directly underneath or onto the base of the re-positioned fiber. The adhesive helps to permanently secure the fiber in its correct place. Immediately after applying the glue, firmly press down on the repaired area. The video shows using a flat tool (possibly a specialized carpet tool or a weight) to apply pressure, ensuring good contact between the fiber, the glue, and the carpet backing. This pressure allows the adhesive to set properly and hold the fiber in place.