I agree with you. Arsenal is now one of the elite teams in the English league and they are the favorites to win the English league next season. Unfortunately they have failed in two seasons and this has really disappointed fans. I don't think Arteta needs to make many changes next season. They just need to play consistently and form a good player mentality. I also hope they will be able to win the English league because currently they have the best squad in the last few seasons.
Due to how well they perform last two seasons, Arsenal is now consider among the top three teams in the English Premier League, and they are among the favorites to win the league after Manchester City.
Arteta and the management don’t need to do much because they still have quality players that can still perform for more than two years to come. In terms of midfield, they only need squad depth, same as defense; they just need to add left back that can be supporting Zinchenko, Tomiyasu and Timber, while they are comfortable with the two right backs Timber and White and their able strong and reliable central defenders Saliba and Gebriel.
The only challenge now is strikers, they need to replace Nketiah and Jesus because lack of striker cost them a lot last season.