It won't be easy for Ten Hag because many key players or influential players in the Leverkusen team in the last two seasons have left so there will likely be many changes.
Maybe I think if Ten Hag manages to maintain Leverkusen's position to be able to compete at the top, that's good enough and to be able to do better than last season I really doubt it.
Die Schwarzroten's summer patch up is immense and high risk. They lost Xabi Alonso plus Frimpong and Wirtz for a merge 150 million, but replaced them with only one key defender, Jarell Quansah, for 35 million. You know Ten Hag inherits a fragile strategy. Yes, they are spending sharp-witted, rising talent and phased reinvestment in Kluivert talks, but up till they land consequential attackers, hope for title or top 4 stability is enthusiastic thinking. Ten Hag needs time and profound pockets cause you know he was a absolute failure with Manchester United, so don't look ahead to miracles next season.