Arsenal is always slow to things like this. I don't know the plan of their management and which players they want to sign. It's clear that the players that they already have in the club cannot win the EPL title after four consecutive attempts. The need of a few new players to add to the team is very important for a stable performance throughout next season.
Gyokeres is a serious target for Arsenal in the transfer market to fill the front line but so far there is no certainty even though there are a number of other names that have also been linked with Arsenal so far. Arsenal's movement is a bit slow at the moment and maybe Arteta thinks there is no need to recruit a number of players for other positions because so far the players they have are very good.
Arsenal doesn't need only a finisher, they also need additional players on bench to strengthen the team when the sea is rough. We have seen how they always become weak in the last quarter of the season due to injuries or fatigue. If they get additional players, that will help them overcome that problem. Only if Arteta does not plan on winning the title.