Too bad this had to happen to Arsenal. In the last few matches towards the end of the season, they looked tired during the match, often made blunders in games and even lost several times against teams that were barely in the relegation zone. Their struggle has gone very far, but yes, no one can be blamed here, the season is over, and they can only lament the real fact that Manchester City deserved the Premier League title this season.
Arsenal lost their focus in the second half of the season, they didn't only look tired. Also, I don't know why their tactic seems not really effective anymore, the players also decreased their performance. There is something wrong between the players and the coach, there is something changes in their strategy and spirit. Another reason is their main striker got injured for a long time, Gabriel Jesus was absent in many matches. Sadly, some other players also got injured as well. This is a bit complicated for Arsenal, they are difficult to deal with injury because they don't have enough substitution players with the same quality as their main players. I think Arsenal needs more players in their squad for the next season. They need to sign some new players with good quality.
Arsenal wouldn't have lost concentration toward the conclusion of the season if they had added new players to their roster. Due to constant fixtures during games, their players became exhausted, and there is no better alternative for injured players.
As always, Arteta and the Arsenal players are not to be faulted for failing to win the Premier League; rather, they should be commended for maintaining their position atop the standings despite not signing quality players. I think Arsenal will take the necessary action by signing quality players by next season.