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They need three experienced players to help them realize the club's success and achieve trophies, the players they have are indeed good but lack mentality. There is no need to make major changes because the squad that Arsenal has is already good, they just need to find some experienced players to make their mentality better. Mentality will be formed when they have players who are experienced enough in dealing with pressure.
It will take time for Arsenal to achieve what Man City has achieved and they will get that experience if they are able to maintain consistency in playing. In the Champions League, experience and mentality are very much needed because the competition is much tighter with several representatives from the existing leagues. Arteta must build this squad to be more ready to deal with pressure and they must try to find the right momentum.
Every team definitely needs a process to be able to win something big. Of course, it's not just a process, it also requires a lot of money and hard work to build a quality and competitive team. I admit that in the last few seasons Arsenal have performed well and are ready to challenge any top team, but the problem is that their mentality is still shaky. Arteta needs time and support so that his players' morale does not waver when they are ahead of others, but this is really difficult to resolve.
Arsenal are on track to win prestigious titles including the Champions League, but before that comes, Arsenal must first prove that they are worthy by winning the domestic title. It is important for all players to appear consistent, and Arteta must be able to keep his team stable throughout the season.