I think you may be understating our squad - and before we go into detail it was never possible to move from where we were to immediately challenging for PL title, but we will be a lot closer to Liverpool this season than last.
Forwards - Son, Kane, Kulusevski was already a formidable forward line as good as Liverpool, add Richarlison as our 4th forward and he's as good as anyone else 4th forward. Moura is not top class but that's where I hope we add another.
CM's - we set up differently to other teams but imo Bissouma, Bentancur, Skipp Hojnjerg is a very solid set of cm's from which we need 2.
After that it gets more tricky - Romero, Dier, Davies was actually a very effective CB combination and better probably than anyone else other than ManCity, Liverpool and Chelsea (but Chelsea have lost their star defenders). Sanchez can be good and then poor, so very inconsistent, Tanganga versatile but inexperienced, Rodon hardly plays. And we really don't know what Lenglet will turn up and evolve into. So we either get another top defender in the next 5/6 weeks or next summer to improve.
Wing backs - Persic is the star, we hope Sessegnon and Spence can pick up Persic's star dust. Other RWB options in Doherty and Royal are not ideal. Overall we need Spence and Sessegnon to work asap to get close to Liverpool.
Goalkeepers - Lloris is fine, and Forster a step up on 2nd GK's we have had since Vorm.
So in summary I'm happy with half the team and hope with wing backs clicking we get to around 75% of the team, Big upgrade from last season iimo.