Better than just flour and water

I need help to find a better recipe for the sourdough bread. I am just starting baking and my goal is to bake whole rye bread. Unfortunattely, several days ago I did so much whole rye that I ate just half of what I baked. At the same time I still have extra starter which I need to feed anyway - I do not like an idea to put it to fridge. So I tryed couple of times simple sourdough bread, which was working OK, but not perfect. While I still need to sharpen my tecniques in baking plain bread I would like to try some different texture bread. I am thinking about adding oil, milk and sugar to it. I remember, that extra ingredients made huge difference when I used my baking machine. Does somebody know of a recipe for 100% sourdough with more than just wheat flour, but not extra fruits, rasins, etc., just bread? I have spent over an hour looking though recipes on this forum as well on many other sites on the web, but could not find simething interesting.

Thank you in advance