First observe whether the nib is upturned. If it is slightly upturned, you can poke the tip of the pen on the glass plate with the tongue facing up, and press it down slightly according to the pen holding posture to reset. If the pen tip is not upturned and cracked, you can clamp the pen tip with the nails of one hand's thumb and forefinger, and then rotate the pen body forward by 90 degrees with the other hand to return to the original position, which can be solved.