Gearing motors for high torque

How do I gear a two wire 269 motor for high torque low speed or a 393 motor for high torque low speed.

Perhaps these posts will help?
the gears inside the motor (which come with the “torque” gears installed, and high-speed gears in a separate packet): https://renegaderobotics.org/motor-gears/
gears & torque in general: https://renegaderobotics.org/gears-torque-crash-course/
motors more generally: https://renegaderobotics.org/vex-motors/