I believe Arsenal can go further in the Champions League and also try as hard as possible in the Premier League, the most important thing is that Mikel Arteta can always overcome existing mistakes without having to feel pressured because Manchester City will always remain their main competitor. I have seen in the last 2 seasons actually Manchester City is not much different from Arsenal, as long as this club remains focused, then they can break Man City's dominance.
Manchester City and other elite clubs have been amazing and promising in the UEFA Champions League, just a better call for the big winning. Arsenal have everything, the one thing that keeps them up is hope and determination. Mikel Arteta have packed his best strategies infront and there's certainly going to be evidence for the team, it may not be now but in the nearest future, there's certainly full hope and success is ahead.
Does that mean a club like Arsenal is not suited to winning big? Every club that participates in the Champions League has the same ambition, they will do their best and those who can be consistent until the end deserve to win. Arsenal has no doubt they have reached their best level in the last few seasons and will continue like that if Mikel Arteta is still at this club, I think they will definitely get one of our prestigious trophies, it's just a matter of time.