I think Arsenal should not have much expected with the existing squad because their opponent is stronger than them.
Arsenal's current injured players are very important. Unfortunately, Arsenal's coach has been very unlucky, even though they have a good chance of fighting for the title, they have very important players injured. I think it's time for the coach to sell the players who have been suffering constant injuries. For example:
Gabriel Jesus, the guy will only return to play in November this year. But this season he has only played 4 games. He spent most of his time injured.
https://www.premierinjuries.com/teams/arsenalFortunately,
Bukayo Saka will play in two weeks and
Gabriel Martinelli will play next month. But
Kai Havertz will only return to play in June, that is, next season.
Well, I will be honest here and say that I don't know how all of this things work, like buying and selling players, can this be done at will by the coach? I thought players are only sold when their contract with the club has expired or something? Or do they simply walk away from the club and sign a new contract with another club? Or maybe renew their contract with the club they are currently playing for if the wish to continue to play for the club?
Sorry if my question looks noob, but I am just trying to understand why a coach may decided to sell or not sell a player, and just as you have said, if the mentioned players are not around to help their club succeed, what exactly is the reason why they are kept and still being paid when they are not adding any value to the club?