Mo Salah is still 32 years old and his performance with Liverpool has been quite good so far, so in my opinion moving to an Arab team would be a hasty decision, especially if Liverpool still wants to get strength for the next season. It is true that they are now with a new coach, but if Mo Salah can give his best performance, then he will get a regular place in the main squad. It depends on how he can show himself to gain the trust of a coach.
Last season Liverpool still had difficulties playing without Mo Salah, his role was an important one for Liverpool's attack line. Rumors about his departure to another team or to the Saudi pro league are also rarely heard anymore. Liverpool know very well what they have to do with a player like him, Arne Slot will also definitely see first whether he is one of the players he will bring into the squad for next season, and I think he still deserves to be at Liverpool. But we'll see the final decision, because the transfer market is still open too.
There's no harm in Moh Salah having at least one or two seasons with Liverpool before deciding to go to the SPL to receive a higher salary before having plans for retirement and his current age is a little older but his appearance is still very strong in terms of competing with young players. But still his performance will be slightly lower because age is very influential in terms of his fitness or physical ability to score in large numbers.
And with regard to whether he can perform even better with a new coach, he must be, because he's a professional player that's very easy to adapt to with the new coach to create a strong team.
When SPL related rumors spread that Moh Salah wanted it, it's just gonna be a rumor this season. The fact is that Arne Slot requires the contribution of such a reliable player to help the coach perfect the given strategy and on the one hand Moh Salah is like a key player to be defended by Arne Slots.