Under Arteta's coaching Arsenal improved very much and its very sure the tough time given to Man City is expected from Arsenal from that much close margin they lost the EPL so they came back very much stronger.
This season's Premier League has ended in an amazing way and Arsenal has certainly improved quite well during this season so that Arsenal have been able to trouble Manchester City in terms of getting the title this season even though Arsenal failed to get it this season. But for next season, I think Arsenal will remain as strong as this season and could even be better than this season if Arteta's coaching can continue to experience excellent development for Arsenal.
They finished in 2nd place and only lost 2 points to Manchester City, that is something very good for them to show, because with what they achieved this season it shows that they also gave a good performance during this season. Even though they failed to become champions and didn't even get any trophies this season, what they showed this season will be very valuable capital for them in the next season.
Arteta is slowly being able to build this club well, there is progress he is showing, but I also appreciate Arsenal management who do not easily fire coaches and they see the progress shown by the coach. Because if they don't see that or they are management who easily fire coaches, then I'm sure Arteta will no longer be at Arsenal, even since the first season he was trusted to lead Arsenal. Now his job is to ensure that they can be consistent and even better next season.