Man United
In no particular order:
Firstly fucking fire clueless Ole Gunnar Solskjær
Hire a real coach(plenty available zidane, conte, etc or take another teams coach)
Hire a real director of football like van de sar
Get rid of the clueless yankee owners
Take Leicesters scouts
Get a defensive midfielder, get a right winger, buy a center back or actually start fucking using tuanzebe.
Sell fred and or mctominay, sell lindelof, maybe sell martial depending on next season's performance, sell lingard(my baller but he wants to leave), get phil jones, mata, matic, romero whoever still on the books that they aren't using, sell em.
Decide what to do with dalot, either sell him or recall him to challenge for the rb position, dan james on loan or actually coach the fucker, rashford likewise needs to be properly coached, proper rotation of players(especially bruno and harry)