Getting a good team is something that takes time people should not expect Amorin to turn things around just looking like that I don't even expect Amorin to turn things around this season with the current state of Manchester United it will take at least three seasons for united to actually compete for any title
If turning things around at Manchester United is by winning the Premier League title next season, I agree with you it will take Ruben Amorim time to achieve that at Manchester United, but if turning things around is to improve Manchester United's performance, I totally disagree with you that Ruben Amorim can't turn things around at Manchester United next season because Ruben Amorim is putting in his best so that Manchester United will improve their performance next season, and with what Ruben Amorim has achieved so far, there's a big possibility that Manchester United will perform better next season.
Amorim just needs to go through the process with Manchester United, to build a team that has been slumped for a long time like Manchester United is not easy everything requires a process and support so it is almost impossible for AMorim to immediately make Manchester United much better especially he does not get big support from management to overhaul the existing squad so I think Amorim just needs to make Manchester United better than last season and that is enough to prove that Amorim has progress in building the team to be better.