Topical antifungal

What herb would you use?

What comes at the top of my head.

You can use a spray tincture or make an ointment.
Native plants:
Oregano extract
Garlic
Olive leaf extract
Bergamot (Monarda didyma) not the bergamot oranges
Calendula
Golden seal (native to you but not to me, unfortunately)
Peppermint
Any combination of the above

Non native:
Neem
Tea tree
Curcuma
Clove

Apple cider vinegar and coconut oil are also supposed to be good, maybe you could incorporate them in making a salve or ointment.  I am sure there are many more.  My experience however is that fungal infection takes a very long time to be got rid of.  I hope this helps, maybe research it a bit more, and good luck.  I am sure other people will come and offer some of their knowledge.

Curcuma and golden seal will turn your skin yellow.

Rosemary oil.

I used to use tea tree oil, and then switched to eucalyptus, which seems to be even more effective.

Grapefruit seed extract. You can use it topically as well as take it as a medicine. Homeopathic Thuja.
Cut down or cut out sugar and reduce carbs if possible.