as you said, if Arsenal really need a change in their title pursuit strategy, that should be prioritized and from my opinion, if they really want to get the EPL title, they should try to prioritize matches in the EPL and consider the UCL as a second match that doesn't need to be prioritized.
and this kind of method can make Arsenal closer to winning the EPL title and if Arsenal succeeds in getting the EPL title, the mentality of the Arsenal players will definitely become more confident.
20 years without a Premier League title of course it is a bitter experience that befell their fans, Arsenal is one of the big teams that has been successful for a long time but after they got the last Premier League trophy undefeated, it actually made their performance every season continue to decline and continue to fail to win the championship trophy so far, even since the bad phase of Arsenal started, of course they are often referred to as a team that does not have a champion mentality, In the last two seasons, of course, we have seen Arsenal start to rise in form and also their mentality as one of the title contenders, but they have not been able to maintain consistency when the final match of the season is played.
Arteta should start trying to improve the mentality and also the focus of the players to be able to achieve what they have been difficult to achieve, I think it is very important for Arteta to bring experienced players who do have a high mentality and fighting power like Declan Rice to squad, so that indirectly of course will improve performance, mentality and of course a higher fighting power of their squad next season.