Remember we won 2 leagues with 198 points with Delph and Zinchenko as left backs, and Liverpool have won the CL and league with Henderson as a primary player. United under Ferguson won things with Wes Brown and John O'Shea.
If we got back up to our motivated best then a lot of players you might not rate will all of a sudden look great. If we're confident and believing then all of a sudden players like Mahrez, Mendy, Walker, Jesus, and Bernardo will all look class acts. At the end of 16/17 everyone not called Touré, Aguero, or Jesus came out looking like there were question marks over their long term futures. We got rid of the genuine deadwood, brought in 4 players, and all of a sudden everyone looks great.
We only need to make the signings that get the mentality of these players into gear. The primary issue is likely removals.
Anyone who's too old needs to go. Bravo and Silva are off obviously, but Otamendi should probably join them. Fernandinho is someone we need to be careful doesn't end up like Touré, if he's got another top year in him then 100% keep but we shouldn't be sentimental. Obviously Aguero stays. A big decision needs to be made about Stones, but we don't want to have too few centrebacks. If we're looking for another LB it might be time to say goodbye to Zinchenko (even though I personally like him). Nobody else needs selling.