I think that the quote of shots from out of the box are pretty high in the League for United.
Whoscored says that from 105 shots 51 were from out of the box, 6 from inside the 6 yard box, 49 from inside the penalty are - thats 48.5 % of all your shots that are made from out of the box.
Just to compare that:
Arsenal Premier League 197 shots, 55 outside the box, 16 inside 6 yards, 126 penalty area = 28% from out of box
Bayern Munich Bundesliga 192/74/20/98 = 38,5 %
Manchester City Premier League 187/76/18/93 = 40.1 %
Goals:
Arsenal Premier League Total: 16 - 1 out of box, 5 six yards, 10 penalty area
Bayern Munich Bundesliga Total: 33 - 3 out of box, 9 six yards, 21 penalty area
Manchester City Premier League Total: 24 - 5 out of box, 7 six yards, 12 penalty area
And now the interesting part of it:
Manchester United Premier League Total: 14 - 0 out of box, 3 six yards, 11 penalty area...
Let's face it like this - your problem ain't really the shots from outside the box as
you already have a high quote for that compared to your overall shots - but the result of it is zero...
Your problem seems more that you do not combine yourself into the penalty box. Because if you get in there your shots to goal ratio really is acceptable. Especially if you look to the numbers of Arsenal who need more than 12 shots for one goal in that area.