Where should be stimulated?
The nerve of the bladder extends to the bottom of the foot. So if you stimulate the bottom of the foot by stepping or other methods, the signal is transmitted to the bladder, and the substance to suppress the bladder that has become sensitive is secreted and returns the sensitive bladder to the normal state.
Stepping on something like a bamboo cut in half is good to stimulate the bottom of the foot.
Stepping on it for 3 minutes in the morning and at night is recommended.
You can get similar things in eBay if you search for "bamboo foot massage".