I agree with you that what Erik Ten Hag has done for Manchester United this season deserves appreciation. We also have to remember how Manchester United were before he arrived, and even at the start of the season they had a losing streak which resulted in them being at the bottom of the table at that time. But slowly they can get up and can collect point by point to take them step by step to the top of the standings. and in the end they can be ranked 3rd, it is an achievement for them.
Manchester United also won one title this season, and that was a good start for Erik Ten Hag to bring another title the following season. Don't forget too, they felt the internal problems of the club which disturbed the balance a little, but they managed to get through it well.
I think if Erik Ten Hag is given a longer chance he can revive the championship passion of Manchester United.
The second season for ten Hag will be decisive - it will no longer be possible to blame everything on his predecessors or on Ronaldo. Although I support United, I think next season will be worse than this one - just at least due to the fact that Liverpool and Chelsea will return to business (presumably) and in such conditions even getting into the top 4 will be a very difficult task.