In this video, I took the extruder apart as it is to show the source of the problem.
The spring that pushes the gear in front of the motor and the roller that squeezes the filament together loosen over time.
The pushing problem may not be present when you first start printing, but after an hour or two, as the environment and spring warm up, the looseness in the spring increases. If you put a thick washer or a wire thicker than 3 mm between this screw, which pushes this roller back and releases the filament when pressed by hand against the front face of the extruder, and the extruder case, and tighten the screw quite a bit (CAUTION, ONLY TIGHTEN WITH HAND, DO NOT TIGHTEN WITH PLIERS), the pushing problem will not occur at all.
After solving the problem by tightening this wire under the screw, I printed the object in the video. The printing took 55 hours, but there was no problem.