Exactly, if Alonso wants him to be continuously praised as a good coach, he needs to repeat the same thing he did in his first season at Bayern Leverkusen coaching them. At worst he should not be on the wrong side of the final result after the season. He is a respected coach more since he won the trophy without losing any match. He needs to continue that performance with them until he fully believe and make that impression to everyone that he can be the best coach everyone wants him to be and like other successful coaches and not just a lucky one as others might foresee it.
Alonso went down in the history of Bayer as the first coach who brought them the title of champions, no matter what happens next, he will be remembered and appreciated for this achievement. I see that Alonso is also preparing some good transfers, so he aims to defend the championship title, if he decided to stay in this team, then it is clear that he will try to develop this team. The time comes for the confrontation between young coaches, Alonso versus Kompany.
Yes, he will be remembered as the coach who brought great success to Leverkusen, he will be greatly appreciated there by their achievements this season. But this is football where a team has to keep getting better all the time, so even though he has made history, that doesn't mean he will be comfortable. How many coaches end up getting a lot of harsh criticism, even though the coach was previously successful, Xabi has to see that.
We also have to be fair in this matter and even Leverkusen and all the fans have to do this. They can praise Xabi when he is successful and that doesn't mean they preclude criticism when his performance is poor. Don't let them forget that they have to criticize because of their success.