To convert the metaphor into an analogy, you can add a clarifying statement that explicitly compares two different concepts while preserving the original meaning. Here’s a revised version of the statement:
"Every road was connected, and each was harder to traverse than the one before it, much like the challenges he faced in life, each more daunting than the last."
This addition maintains the essence of the metaphor while enhancing it into an analogy by drawing a comparison between the roads and life's challenges.