3. Play players in their natural positions

As easy as this sounds, Freddie Ljungberg has a complicated job of taking out Unai Emery’s style from the squad and imposing his own. Because when the players play under a specific style for 18 months, it takes more than 2-3 games to adapt to a new philosophy.
The main problems Arsenal have right now is as follows; lack of width, no structure in defence, and an unreliable midfield. And the biggest issue right now is undoubtedly, the managerial situation. Currently, Freddie, who is an interim manager, is trying to include the big names in the starting line up hoping that they would fix the short-term problems.
However, it has not worked out at all. This is why the first major thing Freddie should come up with is a basic and simplified formation of 4-3-3. As exciting as the front three of Mesut Ozil, Alex Lacazette and Aubameyang sounds, they are three players who cannot play in a 4-3-3, because neither of them possesses the ability to run at defenders and provide a threat on the flanks, which makes the opposition team commit bodies forward.
So first things first, switch to using Bukayo Saka, Aubameyang/Lacazette and Nicolas Pepe in the front three, which they deployed at Manchester United (A). The aforementioned trio would be blessed with pace, much-needed width, and immense threat through the flanks as well as having a quality CF in his natural position who can trouble the centre-backs.