This season, Bayer Leverkusen still has the opportunity to win two trophies which are no less prestigious than the Bundesliga trophy. So next season, Bayer Leverkusen will have to be really wary of by every other team because Xavi Alonso will still coach the team and there is a possibility that it will continue to improve as it is now. I was also quite happy when I saw that Bayer Leverkusen was able to break the dominance of the Bundesliga giants this season so that this could possibly continue next season.
Yes and the titles are the DFB trophy and the Europa League trophy so Leverkusen has the opportunity to get the Treble Winners title if they are able to win 3 trophies at once in one season and Leverkusen is a strong candidate to win 3 trophies in all the competitions they are currently facing. I believe Cabi Alonso is able to make the the players continue to perform optimally until the end, even Leverkusen is unbeaten and will continue like that until the end of the season because Leverkusen only has to fight a little more to achieve all the titles they hope for Leverkusen has secured one title and only needs to secure 2 other titles.
As long as Xabi Alonso coaches Leverkusen, I think the club will continue to perform well. He has a good strategy to improve the club's performance. I think Xabi Alonso will recruit several players at the end of the season to support Leverkusen's appearance in the Champions League and will appear stronger than this, but I think because the impressive performance of Leverkusen's current players will be the target of top clubs to recruit Leverkusen players. Let's see if Xabi sells some of its players, whether there will be a different appearance at Leverkusen next season. Usually, differences in players will cause differences because the club needs adaptation first.