I doubt Xabi Alonso's Leverkusen can dominate the Bundesliga next season. Leverkusen cannot win the title by going undefeated for a whole season. If Leverkusen wants to dominate the Bundesliga next season, Leverkusen management should definitely try to strengthen their squad. We saw the Napoli team dominate the 2022-23 season and win the title. However, last season we saw this team finish tenth in the table. So Leverkusen will have to play very carefully from the start of the season if they want to win the title.
There won't be too many expectations from Bayern Munich next season. Bayern Munich have a strong squad but new coach Vincent Kompany is not experienced enough. I don't know why Bayern Munich have appointed such an inexperienced coach.
If we compare Napoli who were unable to win again in the following season, it was because the coach who led Napoli to victory decided to quit and leave. So Napoli have a new coach and the strategy they use is very different from the previous coach. Leverkusen still has a coach who succeeded in bringing them to victory so there is still potential to win again in the coming season. It is possible that Bayern Munich's performance has also weakened, so Leverkusen will take advantage of this moment to stay in top position.
Yes, it seems inappropriate to compare the situation and conditions between Bayer Leverkusen and Napoli because after all, Napoli experienced a change of coach while Bayer Leverkusen will still have the same coach. So, if Bayer Leverkusen at least doesn't sell many of their key players, then Bayer Leverkusen still has the potential to dominate the Bundesliga again next season. Perhaps, with some purchases also needed, considering Bayer Leverkusen will play in the Champions League next season. Therefore, of course Bayer Leverkusen also still needs good second tier players, so that when they rotate they are at least able or have the opportunity to still get good results.