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.
Almost all the coaches that came to Manchester United after Sir Alex Ferguson, they met same hard luck and Eric Ten Hag was no exemption. Eric Ten Hag is not a bad coach just that Manchester United really defame the coach after he applied all his strategies, but none worked for United. Maybe Bayern Leverkusen acknowledged the coaching skills of Ten Hag, that is why they gave him a chance to continue from where Xabi Alonso ended at the club.
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.
Eric Ten Hag doesn't need much to do at Leverkusen because Xabi Alonso has already prepared and build the players to a strong team so he will inherit an already developed team that won't give him any problem at all. All he needs to do is to make sure he doesn't disappoint Leverkusen's fans and management for finding him worthy of a coach.