The gunners should focus on winning EPL first and if they have achieved that, they can think about winning UCL which I don't see that happening soon only if they can change their mentality and improve their performance up to the standard of strong clubs that are winning UCL.
I don't know why it has being like that, is it that they always lose focus on the matches or they are not just lucky in the league. A lot must be done if Arsenal wants to win UCL. Arteta is a good coach and I hope that he doesn't make any mistake next season and win their domestic league. As long as Real Madrid exists, it will be difficult for weak teams like Arsenal to win UCL.
Arteta definitely has the ambition to bring Arsenal to appear consistent in every competition, of course Arsenal has the opportunity to do so, or they can properly organize their priority scale next season according to the team condition. It is possible that Arsenal can create a different performance between the Premier League and the Champions League, like Dortmund last season, but it would be better for Arsenal to focus on pursuing the Premier League title first. Competition in the Champions League is much more difficult, and Arsenal will definitely have the opportunity to reach the Champions League final like in the 2006 season.
Arsenal has now developed for the better, especially in the last two seasons, they have almost been able to win the Premier League trophy. Meanwhile, in the Champions League last season, when Arsenal faced Bayern, Arteta fleet still looked very unstable, they failed to show their best performance when facing the Bundesliga giants. In the future, if Arsenal succeed in winning the Premier League trophy, their journey in the Champions League will be even more taken into account.