The Arsenal team played well last season. And Mikel Arteta played an important role behind it. His match technique was outstanding. At the same time, Mikel Arteta was able to strengthen the bond between the players. This is why Arsenal's performance was stable. But at the end of the season, Arsenal team lost truck due to injuries of several players. This is why Arsenal failed to win the title. Mikel Arteta must try to stabilize the team. At the same time, the squad should also be strengthened by adding more experienced players to the team. Arsenal also need to tighten up the defense a bit.
I would say Arsenal played well in the last season from the start of the season until the last few weeks but in the end, it seems they didn't give enough potential to continue their good performance and that's why Arsenal failed to win the title. I think after spending money on this team and hiring better and more expensive players, they are now in the situation to have a better chance for the next season.
Now that is very clear, they performed very well and started everything well so that they could slowly climb to the first position in the standings, then there was an assumption that Arsenal would become champions to win the trophy last season. However, all these speculations have unfortunately been broken by the fact that in the end, as you said, Arsenal lost their balance towards the end of the season, they were very easily beaten even by some weak teams. This incident is very unfortunate when a trophy is in sight but they fail to reach it. So far I see that Arteta is really serious about improving his squad including the players on the bench and then I am very happy to see that Arsenal have now managed to bring in Declan Rice even though at a fantastic price from West Ham. I hope he will be a sharp player for Arsenal and hopefully help Arteta win titles from Manchester City. So with all the updates that have been made by Arsenal, I don't think there is any reason for the Gunners to experience another failure next season.