I heard to dust the souls of feet with baking soda but that one doesn’t work for to long and same goes for the palms of your hand any powder thing should do it but is their something better.
To prevent feet from sweating you can buy a aerosol antiperspirant and deodorant that you would normal use under your arms. Only takes a little. Spray tops for toes around to the underneath and continue with a swipe down the bottom of your foot. This would not work so well on your hands but I’ve heard of botox being used effectively for excessive sweating for all parts of the body