Athlet's foot is something coming out, it is not something going in. By that I mean that the fungus forms where your body is eliminating waste, there are metabolic processes behind it. If you want proof, take a swab from the affected area and try to spread it to between other toes - it can't be done.
This is not a random attack, but a real barometer of the internal health state.
So whatever you use must not be suppressive. Simply killing the fungus doesn't resolve the problem of toxins, nor the body's need to get rid of them.
Cleaning up the diet, reducing stress and other sources of ill-health are very important.
As far as treatment goes, drawing-out paste (magnesium sulphate) works as well as anything, and does not suppress. It works by helping remove toxins from the tissues near the skin, thus the fungus has nothing to feed on. Don't rub it in, rather blob it on as thick as will remain, depending on the location. In a few days you'll see a big difference, but keep doing it.
In time, the problem will usually return if you stop treating it. I'm afraid that's in the nature of the thing, but if you can do enough to keep it mild then it is usually a benign problem. See it as a compensatory mechanism, rather than an invasion, and look after general health.