Arsenal's performances have really improved, and it is noticeable. Even as they performed last season, if Arsenal can work more on their squad, I believe that Arsenal will surely do well in the next Champions League competition.
The reason why Arsenal was disqualified from the quarterfinal last season was the lack of experienced Champions League players. I don't think Bayern Munich would have been able to defeat them and send them out of the competition. Arsenal played well against Bayern Munich, but their lack of experience was why they lost to Bayern.From the experience some of their players have gathered now, if they can sign more quality players, especially adding a striker to the team, there will be more improvement. I am not saying that Arsenal will win the Champions League, but they may reach the semifinal or final.
It is true that playing for the Champion League must have a great mentality for its players otherwise they will have difficulty qualifying, but so far Arsenal can only go to the quarter-finals no more than that, this is a valuable experience for Arteta and his players, therefore Arteta will do a better strategy to wake up their mentality.
Maybe only the striker for Arteta is not satisfying they want to find a new striker that is needed at this time, but do you know some names of candidates in the striker?
So far I haven't seen any further news that Arsenal will recruit anyone who most importantly already has experience that makes it easier for Arteta to develop his players.