Ten Hag is full of luck right now, because in any other year he will be sacked so much early and had no chance of stay in his spot.
But thanksfully for him Manchester United still in the bad moment for so many years, so the management dont want to change again the coach, they tried it before and no one bring any solution to the main problem, so they want now to keep him and give more chance to solidify a project.
In order for Manchester United to return to its good old days, it must have stable team management. That's why changing the coach would not be the right move. What they need to do is try to create a club culture like before.
As far as I know, they have a good youth football team, if they manage to make a few transfers along with the talented young players they have trained, the team can become much better