Arteta was not too bad to be Arsenal coach because he was able to make a change after replacing the previous coach and even in his first season as Arsenal coach he managed to present the FA Cup title. What Arsenal needs to do to build the confidence of the players because mentality is important in an effort to achieve success. If this season Arsenal fail again, the next season it will definitely be far more difficult because there are many teams that may have made changes so that it will make it difficult for Arsenal to compete. If the mentality has not been formed properly, it will be difficult for Arsenal to achieve success in any competition because they do not have more confidence.
I agree Mikel Arteta has done good job at Arsenal especially in his first season when they won FA Cup. But to make team even better they need to focus on making players feel more confident and mentally strong. Having strong mindset is very important if you want to succeed in big competitions. If Arsenal does not do well this season it will be even harder for them next season because other teams are getting better quickly. So it is very important for Arteta to help players develop winning mindset which will help them compete with confidence and do their best every time they play.