Arsenal seems to have a consistency problem. They start the season really well but they can't continue the season as they want. They need a player who can get the most out of the players, who can take the team forward and lead the team when they are playing. Most of the time, players start losing points one after another in the second half of the season. This is the problem that comes to Arsenal. If they can find a solution to this, there is no reason why they shouldn't finish the season as champions.
Arsenal's consistency problem lies in the players they buy. Arsenal buys players with good technical quality. I don't see a problem with that, on the contrary, it's a good thing. The problem arises when these same good players are prone to injuries and always have long-term injuries.
Let's look at the case of Gabriel Jesus, he's a very skilled player, when he plays for Arsenal he helps the team a lot, but he constantly suffers injuries and takes many months to recover.
So Arsenal starts the season with all their players, they lead the table, but in the middle of the season they start getting injuries, then at the end of the season they don't win anything. They've been making the same mistake of signing weak players.