Generally reducing spore exposure and reducing day to day stressors (any stress will weaken a rabbits immune system) is best.

If you are using topical treatments, making sure you are covering the entire affected area and giving it time to set in before it’s groomed off is important.

Clean as much of the environment as you can, but also remember that fungal spores can live forever on virtually every surface, so reducing is more realistic than complete elimination.

Keep being persistent. It’s not uncommon for fungal infections to reoccur because they’re so hard to eliminate at the source, so clean as much as you can and be diligent with treatment.

Wick’s had ringworm (fungal infection) since November, then got it again in December and is finally almost done with it. Wick is very susceptible.

Something that worked for my bun perfectly was aztec healing clay with some lemon juice. Together it makes a good paste that you should cover the area with. Generally, the clay has healing properties and is sort of antibacterial, and the lemon juice is acidic which the fungi dont like at all. I applied it to my bun twice a day and just let it sit until it fell off, after a week it was gone.
Other things you can use are vinegar, again because of the acids in it. Maybe water it down a bit with water for the bun skin’s sake.