Step 1: minimize/eliminate sugar and alcohol

Step 2: eat diet consisting of non-processed foods.

Step 3: supplement vitamin d, vit c, magnesium (any form you like besides oxide), and iodine.

I recommend you get blood tested for vit d, and have a hair mineral analysis done by functional diagnostic nutritionist to identify what deficiencies/excesses you may have.

Step 4: exercise and stress management.