I'm also curious about Leverkusen next season, whether they'll improve or not. It will be interesting to follow Ten Hag's journey next season, because it's not just about Leverkusen, but also about him. If Ten Hag succeeds in the Bundesliga, it will show that the problem lies with Manchester United, not Ten Hag. He thrived while managing Ajax, and he also won two trophies during his time at Manchester United, despite their poor performances.
If he succeeds at Leverkusen, it will show that Manchester United is a toxic team, with a poor structure, inconsistent boardroom decisions, internal problems, and so on. However, if Ten Hag fails at Leverkusen, it will prove that Ten Hag isn't a managerial talent. I can't wait for the Bundesliga season to start and want to see Leverkusen's first performance under Ten Hag.
I even think I'm more curious than you are and can't wait for the season to begin so I can follow Bayern Leverkusen to see how Ten Hang will fair in the team. He posed himself as a good coach after his spell at Ajax and he thought his now in the league of elite coaches. When he first came to Manchester United, he felt like he could display Pep and Kloop then. Made changes and win his first few games then he thought he was the price, started treating players as if he was in charge of children. I want to see how he will handle this Leverkusen side, I'm just curious, if he will use same approach he used at United.