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Barefoot is not a solution, there are triboelectric
material-pairs with human skin which will develop
Barefoot does nothing for charged device body
or charged work surface. Against these even a
charge-neutral human body still represents an
ESD current source or sink, depending on the
companion element's charge.
There are well documented control methods.
Use as many as you can afford, or afford new
ceramic floor is not conductive and will not help
is there a ground connection in the power outlets?
if your water supply comes from underground through a copper (or other metal)
pipe and there is no insulator (water meter, plastic pipe, water heater, etc),
then a cold water pipe may be a ground for the wrist strap
For a few years I was in the habit of touching a steel file cabinet beside my desk, just before picking up sensitive computer and electronics parts. I thought it ought to discharge static. A few times I sensed a mild spark go from my finger to the cabinet. I believe it acted as an electron reservoir of some kind. Although it was not grounded I gather it lost its change through the carpet due to dirt and humidity.
To detect static charge consider building this simple transistor detector.