I agree that his work is definitely going to be harder next season than even Ten Hang's. The thing is, it's not only Osimhen that the club needs, they need more than just a good striker. If they sign Osimhen and there's no one in the midfield to help in providing or feeding him with ball so he scored then he won't really be productive for what he was signed for. The club doesn't really need total over hauling, it needs to change certain players in key areas for the team to improve with the proper coach.
Man United is so serious trying to make changes this season and they have tried to bring in a number of players needed. Cunha has officially become a Man United player and now they are trying to bring in several other players such as Osimhen as an addition even though there are several other names. If Man United succeeded in filling a number of players needed, maybe the reshuffle could provide much better results.
The English League does look more competitive but changes can be made by any team because the most important thing is the coach can understand the needs not just buying players with their big names as did Amorim's predecessor.