Arteta definitely learned a lot while he was working at Manchester City and with Pep Guardiola but still, these two coaches are not at the same level and I think Guardiola is much better than Arteta which is the main reason why Arsenal lost the title recently however Arteta tried to do his best.
However, I think time after time Arteta is improving and he is getting closer to making Arsenal finally win the Premier League title. They even gave him enough tools and players in Arsenal who can help this coach but it seems it was still not enough for him and he failed so far.
After Mikel Arteta became the coach of Arsenal, we have not seen a good performance from Arsenal for 2/3 seasons. This team could not even qualify for the Champions League. But Arsenal management gave enough time to Mikel Arteta. And we have seen excellent performances from Arsenal in the last two seasons as well. Despite not winning the title, Arsenal's performance was good.
If you compare Arsenal's squad with Manchester City or Liverpool, it can be said that Arsenal's squad is slightly behind. But in the last two seasons, this team has competed hard for the title. And this season Arsenal is one of the contenders for the Premier League title. Arsenal have the potential to dominate the Premier League if the performances of Arsenal's forward players remain stable.