Far greater things have been done in this world in very limited time.
1. Arsenal fortunes changed drastically when Arteta changed his system to 433. Very simple but effective remedy. Once upon a time, Saka used to be a wingback.
2. Milan & Leverkusen have won league titles, from ashes.
3. City pre Pep, had one title in a range of years. After Pep, they win titles before every other team. It's their's to lose.
4. Madrid Pre 2004, had only reached QF in 2011. Why and they bought huge.. After 2011 they have only once not reached QF. You remember who was Madrid coach in 2011? As you can see you need someone to coach the team to greatness.
Heck even Newcastle and Villa moved from relegation form into top 5 in record time.
Nothing is that hard.
Madrid is ruled by Perez, we don't hear about DoF, Technical Director etc. They win.
Chelsea under Ambramovic, he ruled with iron fist. We didn't hear ooh DoF, Head Recruitment etc having big say.
Under his Rule Chelsea have had 2 UCL titles, while United with United DNA have 3 Titles in its history. Chelsea are just 1 UCL title away from United.
Its not that hard.
Barcelona will win another title before United, while they have had economic meltdown and lost Messi that if we experienced it, probably our club would fold.
Even Liverpool achievements in the last 9 years, is something we can only dream about. Imagine ETH hitting 90 points in a season
Something you and me, know it won't happen because ETH is not a good coach.
ETH is Klopp age mate, while he has never played in a UCL Final game in his life. How do you expect such a manager to take us, to that stage?