Borussia Dortmund defender Niklas Süle said that he mentally struggled to “do the right things” in the past season as he aims to be in his best form for the new football year. “Mentally, I just didn’t manage to do the right things. I was no longer able to motivate myself. I wanted to, but couldn’t,” he told broadcasters Sport1 in an interview published on Monday. Süle had a difficult season and also had physical problems. Due to his lack of form, he wasn’t included in Germany’s squad for the Euro 2024 this summer. But he said that he had “a lot of important conversations and also got help” and…