I have Hashimoto's and am borderline hypothyroid. (Low, but still normal lab values, but all the classic hypo symptoms.) The more reading I've done on thyroid conditions and women's health and the more I've done my own n=1 experiments, the more I've come to believe that carbs are more important that I originally thought both for women and for thyroid patients and doubly-so for female thyroid patients. I make an effort now to have a good carb (usually sweet potatoes) with both breakfast and lunch to support my thyroid. Other things to think about are brazil nuts for selenium (you only need two per day), vitamin D, and magnesium. Magnesium citrate supplements (assuming that they're compliant for Whole30) give you the best of both worlds in terms of easily absorbed and cost effective.
I've read mixed reviews on the goitrogen issue. Some souces say only eat them cooked and avoid them when raw and fermented, others claim there's no reason to avoid them. I tend to still eat them, but usually have them cooked. I've yet to try making my own ferments so don't know how those would impact me.
I did AIP for 6wks last year, but didn't notice any major differences. It did confirm that I absolutely do not tolerate gluten so I've been 100% gluten free every since. (Which turns about to be a recommendation that a lot of functional/natural med providers recommend for thyroid disorders.) I don't plan to ever re-introduce gluten to my diet.