By Julie Kliegman In advance of the seven-year anniversary of his groundbreaking Sports Illustrated cover story, the most decorated Olympian reflects on his mental health journey and ongoing advocacy for industry-wide change. Michael Phelps is so routinely open about his depression and anxiety that it’s hard to remember a before time. But it wasn’t until 2015, when Sports Illustrated writer Tim Layden sat down with the most decorated Olympian of all time, that Phelps started speaking freely about his mental health. He divulged his time in rehab the previous year for alcohol use: “I wound up un…