Regarding player recruitment, I think it is definitely necessary to do it because some players who often make blunders and make Manchester United lose clearly have to be thrown away, including one of the goalkeepers who I think is not worthy of being maintained by the team for next season. In addition, Manchester United's attack line and defense line also need to be completely overhauled because the two lines are really weak and not sharp at all to make the team superior.
MU needs a total chang, the problems faced by MU right now are really severe. All lines of MU players do not show optimal game results. In my opinion, not only changes from the players and coaches, but also from the management and staff/sports director of MU must also need to proven about their capacity to bring in new players and good coach for MU. If the current owner is no longer able to solve the problems from all lines of MU, it seems that achieving the championship will also be difficult.
I agree with you, they need a total overhauling of players and of the Man united management team as well, they can't be doing the same thing over and over again and be expecting a different in result. In fact it's better they even start from the scratch and offset almost all the their players and retain a little key players if they can get the needed results, and further restructure a whole lot of other things going wrong within team's management board, this way, they will be able to figure out what is really the problem with the team and if it's not gonna help them solving their almost a decade of problem.
Man United needs to fix many things, not only the squad, staff but also the fans who sometimes put pressure on the coach and players. How many times has Man United changed coaches and players but what happens is that Man United still can't be consistent sometimes I remember Ronaldo's controversial interview was true. So everything needs to be fixed so that Man United can return to being an elite team in the EPL and in Europe.
Man United must realize, they must start by overhauling the management judging from their CV and track record, those people are indeed competent in their fields. The rest is now from several specialist coaches who are still not okay, and of course players who perform poorly but have high salaries who must be sold. Plus the facilities and departments that are no longer worthy must be renovated and improved. So in general Man United must improve themselves thoroughly.
The fatal thing is the fans who must change, because most fans do not criticize but instead terrorize their own players. That is also a big factor why Man United is still difficult to be consistent. This also answers why former Man United players when they move to another team play well. Because playing in a new club they can play freely. Here I conclude that playing at Man United has destroyed his mentality due to harsh criticism.