One of the most underestimated aspects of the Marston comics are all the New Age elements about mind, body and spirit.
In the golden age Diana would use astral projection, use telepathic machines and there were things about the power of belief like how normal women could become physically stronger just by believing that they could lift really heavy things. These elements existed along side space travel with mystical extraterrestials and microscopic worlds. This gave Diana a really expansive and diverse mythos full of alegorical elements. Wonder Woman didn't have a "style" like she does now with almost everything coming down to greek mythology.
What elements would you bring back to the present and how would you retool them?