I'm prone to that myself.
Here's what I do.
White all cotton socks,( the higher count cotton the better) Bleached each wash.
don't wear the same shoes every day.
Antibacterial soap every day, dry feet & toes thoroughly.
antifungal spray .
Not to be gross... but I've heard that Uric Acid helps kill the bacteria. I don't urinate in the shower so, can't vouch for this personally.