Amorim has set a motivating goal in his own way. It doesn't seem easy for Manchester United to score 10 goals right now, they are pretty bad at scoring goals. Osimhen was talked about a lot for a striker transfer. If they transfer Osimhen, then they can easily increase their goal ratio next season.
Osimhen is a top-level striker who can score well in every team. The 2-2 draw in the Lyon match and the goals conceded by Onana come to mind. Onana definitely needs to be replaced, someone good and able to trust the goal should come instead.
Osimhen on Winter break could have been more, because at that moment if you wanted to get him there are two things that they need to do. First of all he is in another team so you have to convince them to let him go, Osimhen may not want to.

And if you do convince him that would mean you have to pay a lot, he would %100 know that if you are trying to get him during winter break that is a desperation move and he would know that he is needed a lot so he would be asking a lot more than what he would during summer. I am aware that they needed a better striker, and surely Osimhen would be better for them, but without solving their defensive issues, scoring more wouldn't solve anything. they already scored more than once a game on average, the problem is mainly on defense.