I never think Leverkusen can match their unbeaten record next season, but everyone can expect logical things about them next season. Xabi Alonso has a big responsibility to maintain his team's performance, this is the most difficult challenge I imagine for him next season.
It is very difficult to maintain the success that has been achieved, every time a new season rolls around there will always be an increase in competition and different performances displayed. However, I still believe Leverkusen will be the toughest competitor for Bayern Munich and Dortmund next season because they still maintain the squad that has won trophies this season and will likely bring in new players to add to the team's strength. Xabi Alonso responsibilities will be even heavier next season because Leverkusen will play in the Champions League, the level of competition which is more competitive than the Europa League means that Leverkusen must perform optimally if they want to survive longer in this most prestigious competition.
Yes we will find it difficult to think that someone will bring the same thing later, maybe the answer is three, get better, get worse or stagnate, so Leverkusen has a chance of not experiencing the same thing next season, but we also don't know what next season will be like because all teams see Leverkusen's play in the previous season and they see Leverkusen's defeat and can judge where Leverkusen's shortcomings are, That is the basic key to beating Leverkusen with Leverkusen's strategy in the past season, but maybe xabi Alonso has a new plan to surprise next season in his own way or he can no longer be as competitive as before, especially in the champions league which is basically tighter competition.