If you look at the team's performance this season for Arsenal, it's been a bit good, but it's still not enough to compete with other big teams in any game.
But Arsenal still have time to change and improve things now or before next season starts, because without changes from now on, it will always be difficult to get good performances.
We could say Arsenal started this season on the wrong foot as they fell behind, from the start of the league but they soon found there pattern and worked together as a team to push up. They did so well untill the last minute when it matter the most and the goals/winnings where coming which dropped them from the top four in the Premier league behind rivalry team Tottenham for the spot.
It was a young squad and thy lacked a lot of Premier league experience except for few players but be rest assured that would be different this season. With Arsenal looking to improve its squad by making good use of the transfer window. To have signed Gabriel Jesus is the most for them as he would be making those important finishes and 18yard penetration that was lacking.