"To illuminate the path" means to provide guidance, clarity, or understanding in a situation or for a specific goal. It suggests bringing light to a situation or helping someone navigate their way forward. Full definition
At the same time a variety of corrective insights and new perspectives need to be developed in order to illuminate the path toward a new world Christian history. (religion-online.org)
It takes hard work, perseverance, and a good therapist to illuminate the path of recovery. (sanjoseaddictioncounseling.com)
Your real goal is to illuminate the path ahead of you, not to focus on job openings. (sciencemag.org)