If the English Premier League was as easy as the French League, it would have been easy for Manchester United to make it to the top five with their current team, but the English Premier League is always difficult compared to other leagues, so to make it to the top five, you have to perform well. There is nothing to blame the manager for Manchester United's poor performance last season because this manager did not get a good team to manage. When a team has good players and a team is formed with the best players in every position, if a manager cannot do well with that team, then it is the manager's failure, but Ruben Amorim finished the season with a haphazard team and he should be thanked for the good work the team has done under him. Manchester United qualified for the European League in the previous season as well, but they could not qualify for the European League final that season, but in the last season, Manchester United qualified for the final under this manager.
I think the problem of Manchester united is both the coach and the players in a way, you can't coach a club without efficient and reliable players who you think can win matches for you, the first error came from the coach by not drafting out list of players the club should get for him, secondly I really don't know what is wrong with Manchester united players performing very badly, except from Bruno and Amad i don't see who is performing well in that team, the best advice for them right now is to keep signing. Talking about them making it to the European cup last season was the help of Bruno (mostly him), but i think this season they will perform better than last season through the help of their new signings, but they might not make the top five list next season, if they fail to improve.
No matter how bad the players in a club is a good coach will turn them into good and average players the main problem with Manchester United has been a lack of quality coaching staff United has not been fortunate in getting good coaches that understands the strength and weaknesses of their players