Apart from that, it is true that Arsenal currently still lacks a striker, and until now Arteta as Arsenal coach has not made any changes or bought a new striker. However, perhaps Arteta still feels that even with the strikers that Arsenal currently have, they will still be able to compete well in the Premier League next season.
Arsenal don't have a good striker after time of Aubameyang but we need to consider why Aubameyang had to leave Arsenal. It's because Arteta did not want to use that striker in the club and he wants to build up different tactics with less dependence on a traditional striker like Aubameyang.
Gabriel Jesus was brought to Arsenal as a replacement for Aubameyang, after two seasons, it seems the Brazilian player failed to convince people that he is a good striker for Arsenal. It's not surprising because he was not a main player in Manchester City and in his national team Brazil, he is part of their crisis on the striker position.
Currently Arsenal have only made 2 purchases in the transfer market this summer, namely making permanent David Raya who plays as a goalkeeper and also buying Riccardo Calafiori from Bologna who plays as a center back. So until now Arsenal has not bought a new striker.
Signing a long contract with Raya and buying Calafiori from Bologna are very good activities from Arsenal to enhance their defense. They need to have good defense first before anything else to win Premier League. In last two seasons, Arsenal played well and their attacking system worked well too. Having good defense system will help them to avoid defeats and minimize lost points and if they can improve their attacks, they can score more goals, get more points too.