Try out new foods, new recipes, new cookbooks... experiment with your cooking. Get familiar with the produce aisle. Don't judge the book by the cover. Many vegetables can be a bit intimidating if you have never tried or cooked it before, but there are many recipes online and cookbooks at the library you can check out, to help you prepare different things.
If you have never tried Kale, put it in a soup today. Lets say you have never had a baked sweet potato, look up a recipe online and give it a try. Maybe you have never had eggplant, throw it in your next Italian dish you cook.
There is a huge selection of fruits and vegetables out there, and most of them have a lot to offer, vitamins, minerals, and antioxidants.
My suggestion today is to, go out and buy a new cookbook or check one out from the library and give a new recipe or food a try today.