The decline in Bayer Leverkusen's goal productivity began to appear when they managed to achieve a dramatic victory at Augsburg headquarters, they were only able to score one goal in that match and Leverkusen achieved success when the match was almost over. After that, Leverkusen played another Big Match, they were forced to use all their energy to face RB Leipzig's very disciplined game, a dramatic comeback was achieved in that match.
Leverkusen does not have deep player resource like Bayern Munich and they have many young players in their squad who don't have enough experience to use their energy wisely through a match and a long season. Xabi Alonso is responsible for it too because as a head coach of Leverkusen, he must request his players to slow down in playing intensity when necessary.
Now Leverkusen is starting to run out of gas, even though they are playing at their own base, they are unable to secure full points.
Now Leverkusen have only 2 points more than Bayern Munich and we knew what happened with Dortmund in the last season. With Stuttgart and Dormund at third and fourth positions with only 37 and 36 points while Leverkusen and Bayern Munich with 49 and 47 points, Bundesliga seems to be a race between two top clubs only. Because the competitor is Bayern Munich, Leverkusen must be very careful if they don't want to be another version of Dortmund in 2022 - 2023 season.