I just went through this myself and can tell a huge difference in the way my body / joints feel. I also have barely any itch on my scalp. Here's what I did:
1. If you're vaping, quit or cut back significantly. This is the single most helpful thing and i noticed a huge difference when cutting back to almost none.
2. Eliminate sugar. I know its very hard, but stop drinking gatorade, soda, don't eat sugary cereals or poptarts etc. Sugar is one of the worst things you can put in your body, and our western diet leads us to believe 50+ grams of sugar per day is just fine. It absolutely isn't. This is the biggest player for chronic inflammation. Sugar is also included in empty carbohydrates such as white bread, white rice, etc. Try eating whole grains as these are complex carbohydrates and your body responds to and digests these differently.
3. Exercise. Every day. This is pretty obvious
4. Get a solid serving of antioxidants every day. These help fight off oxidation which can lead to DNA damage and disease. Examples include berries, spinach, whole grains, garlic, dark chocolate, nuts, leafy green vegetables... Just look up a list. But this step is especially important of you have a shitty diet and sedentary lifestyle.