Arsenal's problem is the same this season. I would say that if Arsenal management wants to dominate the Premier League, they should spend more money. Add more talented players to the squad. Otherwise, it will not be possible for Arsenal to win the Premier League title.
I don't know about you, but for me Arsenal has a very strong squad and that's why they have been competitive for at least three seasons right now, they have a strong team just like City, Liverpool, Chelsea and United. The reason why Arsenal failed to win the title in the last two seasons is because they were competing with a winning machine in City, and the reason why they won't win it this season is because Liverpool are impeccable this season.