Avoid all rancid oils, vegetable oils, dairy, fish oil, all grains and legumes, most sugar (including excess amounts of some fruits like mango, but most fruit is fine, especially apples). Avoid all soaps, shampoos, tap water and stress.
Megadose on dandelion root (chop and steep, drink and eat), green tea, green apples, berries, sunlight, icy water, land animal fats, meditation and slow breathing.
Some combination of the above factors should make a difference for you. It's worked for me, I'm often zit free for weeks at a time when I'm strict. But I'm still an instant boil farm if I eat some pizza!
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.