Guardiola is Manchester City made a lot of improvements and they have a much better team compared to the last season. I think one reason for Arsenal to lose the title to Mcnshter City is Guardiola in this team otherwise they have much better players and good teamwork but that's not enough for a race with a coach like Guardiola because compared to Arteta, Guardiola is much more experienced and when Arteta was assistant coach he was working for Guardiola in Manchester City.
Now the best thing they have to do in Manchester City is to even extend the contract of Pep Guardiola and make sure they are going to have this coach for a long time.
Arteta was close enough to become champions with Arsenal, maybe it's because of experience, maybe because of the selection of players for the team, but City still remains one step ahead of Arsenal. And if you look at all the seasons that Arteta worked at Arsenal, only in the last Arsenal did not have the usual slump during the season, while for City it is a usual thing. Arteta is still learning from his mistakes, it takes time, but I don't know, it seems to me that Guardiola will not allow Arsenal to become champions.