i thought the upanished were a form of storytelling that were for people of normal society to follow since most people couldnt unerstand the vedas.correct?
By practicing what is taught. By making the wisdom revealed a part of my life. By living the prescribed lifestyle. By cultivating the qualities that are recommended and dropping the ones that are considered an obstruction. Aranya means forest. Aranyaka means "of the forest". Not sure where you get retreat from this.
Do not take the meaning literally. If you do that, it will be like looking at the finger that is pointing, rather than looking at the thing that it is pointing toward. The forests were the places of retreat from the day to day rat race in ancient times.