It's been too long since their last trophy, so I don't think Arsenal have the champion mentality anymore. Therefore, what Arsenal need is not just a good squad, but also a coach who has that champion mentality. Unfortunately, Arteta doesn't have that, and I think that's what makes Arsenal fail every season. They often have a good start but always stumble at the end of the season.
I'm not saying Mikel Arteta is a bad coach, but he is not the right coach if Arsenal wants to win the title at this time.
Sometimes a team just needs a shake-up. Maybe another coach, even a little worse than Arteta, can give it to them, who knows, this is already the realm of psychology. At Arsenal, after several years of confident progress, obvious stagnation has begun, it may be replaced by a breakthrough (does anyone believe in this?) or continue to decline. Maybe Arsenal really should change their manager to get out of the comfort zone they have reached.