Ten Hag should be given support, he was a good coach before but what happened when he was at Manchester United destroyed everything, I think overall and it's not just Ten Hag who failed at Man United but several previous coaches did too so I still think that Ten Hag has good qualities like he did at Ajax so there is also a possibility that he can rise better with Leverkusen but the lack of management support makes it a bit difficult.
We all hope Ten Hag does well. The fact that United have struggled with several coaches who have been brought in other than Ten Hag proves that the problem is not only in the ability of the coach. But Ten Hag's challenge will actually start for the new season. If he does well, then the trust in him will increase and once again prove that he does have good ability. he may have to get full support from the existing team.
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.