Are you going to be using any kind of nasal sprays?
I've been exploring the whole mold/mycotoxin thing for a while, and the best practitioner that I have found on the topic is Evan Brand ( here's a podcast with him that I liked). I highly recommend that you check him out. He's not the "mold guy" per se, but he does talk about it alot. He also goes over things like SIBO, and parasites.
Anyways, he's treated a couple thousand patients at this point ( I think), so he is definitely a credible source on this topic. He mentioned that airborne mycotoxins are one of the biggest problems. However a good chunk of patients that he sees also have intestinal or nasal fungal colonies which also release mycotoxins.
From what I've learned from his videos and podcasts, an intranasal spray like Xlear Rescue would be a good idea as an anti-fungal, and also some binders to bind the mycotoxins. If you really want to attack this with all you've got, you could also get a urine mycotoxin test (which is like $300-500), which will really let you know which mycotoxins are the issue. Then you can buy the appropriate binders and try to clean them out that way.
Here's a chart if you're curious.
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Article : https://mosaicdx.com/resource/comprehensive-guide-to-mycotoxin-binders/
Actually, I feel like part of the reason that the anti-vitamin A idea caught some traction could be because the increased fiber is helping eliminate mycotoxins. I feel like that's certainly a possibility, since reducing bile absorption will increase fat-soluble mycotoxin elimination, assuming your bowels are moving quickly enough.