It would be lovely for Bayer Leverkusen to remain in the German Bundesliga title race for a long time, but after Xabi Alonso left Bayer Leverkusen this summer and Bayer Leverkusen sold their best players, it will be difficult for Bayer Leverkusen to remain a threat for Bayern Munich. I'm afraid Erik Ten Hag can't lead Bayer Leverkusen to win the German Bundesliga title because Bayern Munich has built a good squad depth that can win the German Bundesliga title for seasons to come.
With the quality of players Leverkusen currently has, it will be very difficult to compete with Bayern Munich, as Kompany's team is much more developed. Erik ten Hag arrived at a time of rapid development, but several of Leverkusen's potential players have left with Xabi Alonso's move to Real Madrid. The most realistic option is to fight for a top-three finish, as fighting for the title against a much superior Bayern Munich is a significant challenge.
Bayer Leverkusen will be ready to fight again with their new manager. They will face Bayern Munich, who will be their most serious rival for the title. I predict they will finish lower than last year because I don't trust their manager and they've lost key players.