Arsenal's main target is not the Champions League but the Domestic League, winning the Champions League is a bonus for Arsenal, but Arsenal's game must remain consistent in the Champions League, even though there are many choices that Arsenal will take next season, that doesn't mean they are unable to compete, Arteta must focus with stamina and mentality that will be built next season.
IMO, the mentality of the Gunners players has been sufficiently developed, it has been proven that they are able to consistently compete with City in their domestic league. however, their efforts have not achieved maximum results. It's natural, that's why every club that is building needs a process to reach its highest level. in fact, Arteta is in the project of building foundations and making Arsenal much more competitive, his aim is none other than so that his team's squad is able to always perform optimally every time they face a new competition, especially in the Premier League competition. Currently Arteta is trying to bring in several new arrivals who they will bring in in this transfer window, Arteta and Edu are trying to make Arsenal much more competitive. It seems their goal remains focused on the Premier League, but if Arsenal can go through phase by phase in the Champions League, they will do their best.
Arsenal currently only needs to be consistent and bring in a pure striker who is skilled at scoring goals. thus, Arsenal's game will be much more efficient. I'm pretty sure, at least Arsenal will be one of the teams that becomes an obstacle to other strong teams in the Champions League. for the Premier League, as in the previous season, their target is to break Manchester City's dominance. Regarding mentality, the Gunners' young squad is good enough at least for the Premier League. in the Champions League, will be a new challenge for Arsenal.