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Yes, you are right, it is not easy for every club to achieve their expected targets even though they only focus on one competition, like Tottenham last season where they only focused on the Premier League because they did not play in the Champions League, in fact they still had difficulty winning the Premier League title. Even though at the start of the season he seemed to consistently win, as did Arsenal, he still had to perform as well as possible in the Champions League because this is a prestigious competition even though his target was to win the Premier League title.
I believe Arsenal can go further in the Champions League and also try as hard as possible in the Premier League, the most important thing is that Mikel Arteta can always overcome existing mistakes without having to feel pressured because Manchester City will always remain their main competitor. I have seen in the last 2 seasons actually Manchester City is not much different from Arsenal, as long as this club remains focused, then they can break Man City's dominance.
What happened when Tottenham focused on one cup last year? Nowhere. Arsenal has a chance. Premier League, Champions League in two shots. Its mental, not simply talent. Arsenal plays wonderfully occasionally, then chokes. Thats their heads, not coaching. They fear. They doubt their chances. City? When they smell blood, they strike. Not afraid of anyone. They hope to win. The difference.
A mental shift is needed at Arsenal. Every game requires self-confidence. They require a killing instinct. As in life. Why should others believe in you if not you? Arsenal needs to win, not simply compete. Its possible. The talent exists. But they require inner strength and a winning mindset. They'll only beat City this way. They'll only win those cups this way.