This is just like the beginning of his career for United, it is his first full season he will take the club as the manager and the first transfer window he’s had. There is still enough time for him to work and try to get his team to shape. This season there are not much expectations for Amorim other than finishing in top 6 this season, any other achievement better than this will be a plus for Amorim, we can’t judge him just yet until his 2nd season at the club.
Manchester United need to consider the long-term future of a manager, and if he continues to sack players then it will be difficult to achieve success.
Amorim needs to be given ample opportunity to build this team into a more developed one. If he's fired too quickly for reasons of inability to deliver trophies, it will be difficult for any manager to make changes.
Manchester United's performance has improved slightly, and I think Amorim needs to lead the team to a top-five finish so that Manchester United can slowly emerge from the problems they've faced.