It is true that the season is not long yet, we will see how much skill the players have acquired on the field. It will not be easy for Liverpool to win matches this season. Other teams are working hard to win this season. It is true that letting Diaz leave the club could be the biggest mistake of the summer. It is not possible to say anything specific about football matches. During the game, unexpected things happen on the field that are impossible to imagine, I think it is possible to understand how much skill the players have acquired by patiently observing the game.
Liverpool are not left alone because it is also concerned of other teams, they all have a lot to battle with in this coming season, because almost all the top teams have navigated through this transfer window and they always go for the best and achieve their aim. Diaz departure from Liverpool was a mistake but I trust Arne Slot on this because he knows what he's doing and he will make sure a filled up that position despite is not going to be easy for him. Luiz Diaz deserve more than what he has been getting from Liverpool because I am really happy for him for making this decision at least he is now earning more than 100% of what is earning before in Liverpool i just feel like they don't appreciate him with the kind of money they pay him.
While other teams are building or maintaining their strengths, others are doing the same, so they must continually strive to remain the best and compete for or defend a title.
It's true that when a player considered a key player leaves, it's considered a mistake, and we all regret it. However, all decisions are in the hands of the coach, so all we can do is fully trust his actions, even if they sometimes don't align with our expectations, and question his rationale for making such decisions.