NEW YORK — Matt Carpenter never thought he would make it back. The infielder could not figure out his swing. He went 1 for 3 on Oct. 3, 2021 against the Cubs and the veteran Cardinals infielder walked out of Busch Stadium for what he figured would be his last time. “The major leagues is a tough place to be when you’re not at your best and when you’re up at the plate searching for your swing and not full of a ton of confidence,” Carpenter said. “It’s a tough place to be in and that’s kind of the spot I was in the last couple seasons.” A three-time All-Star and career .263/.369/.457 hitter who h…