Now it's time to support Ten Hag because he is not bad as currently media trial is going around him achieve some good targets at Ajax with most chances Bayer Leverkusen is going to be had same conditions which could be favourable for him.
Premier League is always toughest, but Bundesliga is having similarities with Eredivisie which will give boost to him for having better results Borussia Dortmund is also under development and RB Leipzig is also doing not good these are good encouragements for them to have better results and spot. Manchester United is having completely different situation with their problem is long run which preventing them from having success and better results Bayer Leverkusen is having much better condition new players are coming which is also good.
It is very awkward for you to say that the Bundesliga is having similarities with the Netherlands Eredivisie, like how and in what aspect are you talking about? When Ten Hag was coaching Ajax, he was successful for three consecutive seasons before he left for Manchester United that almost ended his career due to their poor performance. Moreover, before Eric Ten Hag became Manchester United's head coach, the club was already in dismay and ETH couldn't figure out a way to take them out of the problem the club was facing but yet he achieved two trophies for Manchester United namely, the EFL cup and the F.A Cup. Winning trophies despite the challenges of the club shows that Eric Ten Hag is a good manager and he will perform better at Bayern Leverkusen because he met the club at a good state, unlike Manchester United that he met when the club was already destabilized.