There is a first time for everything. Maybe this season Arsenal will be better in the Champions League and can progress to the quarter-finals and beyond. They are good as a team, they are good in defense, they don't have difficulty in scoring goals. Of course, there is always a chance of the draw, but as long as they play their own game, there is no team they cannot beat.
This season, they are advancing assertively in both the Premier League and the Champions League. I expect them to push their limits and do better.
Even though Arsenal this season said it was very easy to advance to the round of 16 and become group champions, in the UCL, even in the round of 16, nothing is easy because even the unseeded team can make a surprise considering Arsenal's track record of rarely going far. As far as I remember, Arsenal's track record in the last 10X 16 has always met strong teams.
Arsenal have difficulty scoring goals because they don't have a striker who is hungry for goals, they should look for a striker in this transfer market. But I'm not sure if Arsenal won't bring in a striker in January, because Arteta wants every player to be able to score goals, not rely on just 1 player/number 9 because it's easier to predict how Arsenal will play. So he doesn't want to sacrifice his tactics for the sake of just one striker.
In the groups stage Arsenal achieved good result and were able to qualify for the next rounds in the last 16 with 13 points, but Arsenal could not win all the matches in the 6 matches they played and suffered 1 defeated when facing a club that was not too strong so it can be concluded If Arsenal is still not very good when facing bigs clubs in the next match in the Champions League, especially since they have a defense that is not to strong. In contrast to their strong rival Manchester City who achieved perfect result and did not experience defeat in the group stage, so Manchester City is definitely better favorite over Arsenal.
However, at least Arsenal can fight this season to achieve better even though they are not the favorite, but if they can show even better after they recruit new striker and make their defense stronger, I'm sure Arsenal can achieve the result their fans expect because they still have opportunity this season and he can also beat Manchester City in the Premier League which is definitely a good achievement.