Arteta already has a good experience with Arsenal and last season did well despite failing to make it to the champions league, but they have evaluated everything Gabriel Jesus and Rafinha will be brought to Arsenal to strengthen their attacking line they are sure that next season will be tough competition but Arsenal can overcome it all from its previous slump.
And some of the signings were clear they wanted to be stronger because Arsenal didn't want to be derailed last season.
Yes, at the beginning of last season Arteta faced quite a lot of pressure, even he had received a warning that could get him fired. Luckily he was still given the opportunity to fix the problem. With the results achieved by Arsenal last season, it indicates if Arteta's performance has seen fruition and of course he would want to maintain that condition and make it better as much as possible, and signing Gabriel Jesus was part of that plan.