Man United is indeed performing badly and really has no hope left in their domestic league but don't forget they didn't have the same fate in the Europa League, where you could even say their performance was quite good. If Amorim really prioritizes the Europa League above all else, I am pretty sure that Man United has a big chance to win the trophy, and I think I would also dare to bet on their victory in the next match.
Before facing Lyon in the Europa League quarter-finals, United will still face two teams that will not be easy to face, Nottingham and Man City. United players' confidence may currently increase from the last few matches, winning against Sociedad, drawing with Arsenal, and beating Leicester with a score of 0-3.
Players' confidence will be better if United manages to win or at least get a result that is not lost from the two matches before facing Lyon. As a coach, I am sure Amorim will not only think about the Europa League. Even though there is no hope in the Premier League, he will still do his best.