We haven't tried everything, in fact 6-7 years in I'd say we tried almost nothing for a big club looking to replace Fergie. Hired Moyes, we have time to correct that mistake but we hire a guy due for retiring, then we watch the Chelsea debacle unfold and decide to hire damaged goods and watch the same thing repeat, both Roman and Ed don't back him and it ends in tears. Then we hire an ex player who's not qualified.
Meanwhile the club is still yet to hire a reasonable top manager of which there are many and appoint a director of football. Jose was the closest to it but he was a flawed hire by the time we look at him with all the warning signs. We miss out on managers and players and hope to fix it by splashing the cash after the fact.
Jose was 6th, 2nd, and on course for 6th-8th. He won Europa which got us into the CL while finishing 6th with Pogba, Zlatan, Bailly and Miki.