I think it will be difficult for Bayer Leverkusen to challenge for the Bundesliga title next season because Bayern Munich is building up a squad that can win the Bundesliga title in the next 5 years, which will make it difficult for Bayer Leverkusen to win the Bundesliga title. Secondly, Bayer Leverkusen sold some of their best players to other clubs, which will make their performance decline, and that will even make it more difficult for Bayer Leverkusen to rival Bayern Munich for the Bundesliga title next season.
The squad owned by Leverkusen can make a new step with Ten Hag because if they have the support of quality players, it will make it easier for Ten Hag to build a team. This is what needs to be maximized because a number of core players they had in the previous season have joined other teams and even though they have difficulty competing for the Bundesliga title with Bayern Munich, at least being able to compete in the top three positions until the end of the season is more than enough. Ten Hag needs to get support from all parties and even though most people doubt him, he needs to be given the trust to prove it.