The question you are asking me in general terms is this: how has any team (excluding Man City, PSG and Chelsea), that isn't consistently in Europe, managed to dramatically improve their on-pitch fortunes in the last decade? Or conversely, how have teams managed to completely blow the standing they once had?
Spurs, Leicester and Wolves have managed to do this in our league; direct competitors. RBL, Lille and Lyon have done it slightly differently in different leagues, but still around recruitment and talent pipelines.
The best examples of the opposite are United or Arsenal -- terrible recruitment of ageing and/or substandard players, not replacing the quality that left.
On Vlasic, Lookman etc: doing the right thing badly doesn't mean it's the wrong thing to do.