It is very difficult to get the same good performance from Manchester United as before, but some coaches with a good strategic approach can lift their spirits. So far Ten Hag is not the one who can make Manchester United really recover, of course because we can see that his performance at Manchester United is very inconsistent. Firing Ten Hag is one solution, but it doesn't mean the problem is solved.
It doesn't take a lot to see the massive difference between the Manchester United from today and the one from around the 2000s to 2010. Today they have ten Hag and back then they had Alex Ferguson. Just look when Alex Ferguson stopped his career (2013) and when they won their last Premier League title (2013). They have never managed to successfully fill the gap that Ferguson left behind. Manchester United used to be the biggest club in the world, at least on the same level as Real Madrid for a while. But it seems to be over, which is hard to believe by the way as it is not a lack of financial resources, but of managerial competency. Ten Hag is the wrong guy and all the other coaches they had were never really able to take it to Ferguson's level. And now they are at a point where they are not even respected as a title contender in the Premier League anymore.