Now since the season is over, the teams are trying to improve the team and hire more and better players for their teams to have better performance in the next season. But, I think considering the performance of Xabi Alonso and his players during this season, the main goal for Leverkusen should be keeping the players they have and they should try to have a more stable team.
If they can have the same performance in the next season, they can be definitely the main team to race for the Bundesliga title and they can even have hope for the Champions League.
Bayer has a good squad, maybe Alonso will try to improve some positions, but he shouldn’t demand big finances for transfers. The next season will be a new test for Alonso, whether he can repeat the success in the Bundesliga, how Bayer will play in the Champions League, these are all very important questions. If Alonso had left for Bayern and Bayer's results had worsened, everyone would have said that the reason was obvious, but if he decided to stay, then he would have to work even harder, staying at the top is always more difficult.
At least Leverkusen has won there game against Kaiserslautern today in the german DFB Cup.
And that 45 Minutes with 10 players after a red card means something i guess.
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Imagine if Bayer had won the whole season and ended it with two defeats in the finals. It would be a very strange feeling

But if Kaiserslautern had won, that would also have been a miracle - after all, they are only the 13th team in the second Bundesliga. This team also surprised everyone and I hope to continue to progress. Overall, I am very pleased that Bayer won and did the golden double (without a single defeat in Germany during the season).
Bayer Leverkusen was the best team this season, I would be very surprised if they did not win the cup apart from the league championship. They played great against all German teams throughout the season, and I did not think for a moment that they would lose in the cup final. After many years, they made their fans happy with such statistics.
After their performances this season, expectations have increased a lot, we are now expecting the champions league championship

Leverkusen performance this season has been really tremendous not untill they casually lost to Atalanta in the EUROPA final which I felt should have been their highest priority to secure other than the German cup final but nevertheless they at least secured one out of the both finals played. How could they have lost this one, going two finals and not winning any even for an under club like Kaiserslautern, it would actually be a bad recognition in the face of Xabi and might affect his career probably his continuity as the coach of Leverkusen.