What I see, Amorim actually only needs to do a simple in-depth study and what is clearly visible is the back line in Man United's defense which still looks very weak. Even everyone would say the same thing if Man United's forward position was still a little better and could still be relied on. However, the defense always appears inconsistent. So, Amorim just needs to start everything from the worse things like replacing defenders who are no longer productive. If the coach can do this slowly, I am sure Man United will definitely experience slow improvements.
I think the study should be a general study of all positions and the players as well because some of them are not playing very well as expected and it is affecting the image of the team generally.
Most coaches are complaining of some of their players, and when Ten Hag complained, many people blamed him and accuse him to f not knowing his job despite all he has achieved before joining Manchester United. Now Amorim is here and he is experiencing the same thing, nothing has changed since he joined the club, in fact things are getting worse because he is yet to get the best out of the team.
Maybe the Manchester United management need to sell some players and provide enough money for signing more players, and they should also find out the main problem the team is facing in order to get solution to the problem.