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"Has anyone managed autoimmunity with food? I've seen several people who went on a keto diet and psoriasis disappeared."

I would think the first step would be elimination of food entirely, via fasting - perhaps for 16 hours at first, then 24 hours, as a very simple, first order experiment.

In terms of a workable troubleshooting methodology, that would be the most efficient first step. Then you can add things back in bit by bit.

I think there's a deep human tendency to wish to solve health problems with the addition of food. Depending on the decade it's superfoods or antioxidants or purple veggies or beef broth or whatever. This is probably a delusion.

I think you can indeed affect your health with food - but only by subtraction. So save yourself years of "is it gluten or isn't it" and just see what zero calories does for you right now.