Ten Hag must fight to win over the fans, and that can only be done by leading Leverkusen to consistent victories. Meanwhile, regarding Ten Hag appointment as the new manager, Leverkusen management must have conducted a thorough evaluation of his capabilities. They wouldn't carelessly appoint a new manager, they clearly choose a manager who shares their vision. However, Ten Hag poor reputation with Manchester United is always the main narrative, maybe in Leverkusen, Ten Hag performance will be better.
I don't know if Erik Ten Hag can replicate what Xabi Alonso did at Leverkusen it's not an easy task cause not many clubs have had such great unbeaten run but since Ten Hag has got experience in the league before now it shouldn't be a tough task for him, I expect that he should have more winning than lose bit if he fails to then he has no business in the Bundesliga coaching a team like Leverkusen. This is an opportunity to silent his critics who think he's not a good manager.