It's not just a matter of Arsenal's divided focus so that they don't play optimally in the Premier League, the proof is that in the previous 2 seasons when approaching the end of the season Arsenal only focused on the Premier League but they also failed to maintain consistency so they had to finish in second place.
The problem now is that Arteta can't create a much better team mentality so that they can't compete fiercely when under pressure towards the end of the season, especially with several injured players so they can't maintain their performance when Arteta rotates players.
I think Arteta has to bring in a lot of star players who can guide the young players in the squad to be more confident when playing under pressure, otherwise the same thing will continue to happen.
Yeah true, I also think that the club also lacks squad depth, in the sense that, when the main players for a particular position is maybe injured for a particular period of time maybe 4 -12 weeks. In his period of absence who takes over, is the substitute player effective enough to at least fill in the boots for that period of time his away? I think that's another Arsenal problem too. If the main players get fatigued or injured do they have reserves that can perform at top levels, I guess no.