Arteta is just looking for the right formula for his players, because now Arteta already has many options to rotate players in his main squad, hopefully he can be consistent until the end of the season.
Not sure what other formula you can expect from Arteta next season, but I think he has prepared a good strategy for his team based on needs. Arteta has a sufficient stock of players in his squad list for next season, but regarding performance issues, of course it won't be guaranteed to be as good as expected.
Arsenal are a tough competitor in the Premier League next season and I admit that. But anyway I'm not going to lie about wanting that Manchester City will still remain the favorites in the Premier League next season. Arsenal can certainly threaten at any time, but I hope Manchester City doesn't make too many mistakes in their quest to win 4 titles in 4 consecutive seasons.
Arsenal not only have a large number of players in their squad because the most important thing is, Arsenal are trying to have the main players and second-tier players at least have a quality that is not much different. Because only then, Arsenal will be able to play consistently even though Arteta rotates players to do better in the Champions League and of course in the Premier League too. But even so, I personally still unsure for Arsenal in the Champions League, even though Arsenal chance to qualify for the round of 16 is still very possible. But still, to go further up to the semi-finals I think the chances for Arsenal are still very low.