Before coming to Man United, Ten Hag was a very potential coach, but when he coached Man United everything changed and this did not only happen to Ten Hag, even all coaches who came to Man United experienced the same fate. Ten Hag was still lucky because he was still given the trust by Leverkusen to replace Xabi Alanso who went to Real Madrid.
This is the time for him to prove to the world that he is a coach who has a good vision and mission in building a squad, Leverkusen is the same as Ajax in terms of their game. And in Leverkusen of course there are not too many problems, especially Xabi Alanso left a good squad, of course Ten Hag has the opportunity to prove that he is still worthy of being a coach. In addition, in Leverkusen there is also not too much ambition and pressure applied like when coaching Man United, of course this will make it easier for Ten Hag to concentrate on building the Leverkusen squad so that it can compete in the Bundesliga next season. So I agree with you, give him full support to build new strength in Leverkusen.
Seriously, I’m expecting Ten Hag to make Bayer Leverkusen bigger and stronger than before. I believe with what you said, Ten Hag is an experienced coach; he knows how to handle a team, and I can say even in Manchester United, the manager looked good but was not able to deliver the expected result, and that is what matters. Bayer Leverkusen's competition is not really tough, as the competitors Manchester United are participating in.
I think the toughest competition Bayer Leverkusen are participating in is the Champions League, and Ten Hag has the experience. He knows how Champions League competition works, and he knows how tough it is, so he will be fully ready and strengthen the squad to be able to compete next coming season.