Since he had many injuries, at that time many teams also canceled their intention to recruit Neymar, even the last team that signed him also ended up having a conflict because Neymar was considered not to have contributed anything after they paid a lot. So his last choice was his childhood club who still wanted to accept him, no matter what. Indeed, the emotional connection between a childhood team and a player is very tight, they can return at any time with the door always open.
Neymar appears to be exiting his prime and so expecting those exceptional performances from him may only amount to some sort of waste of time as he is most likely not going to deliver as much so it will be even better if they stop trying to invest so much in getting such a player who will probably be heading towards retainment soon by virtue of the fact that his performance is drastically dropping so bad that they almost cannot just do anything about it
During the move from PSG, Neymar could no longer be relied on to score as many goals as he did at Barcelona and PSG and it is true that what you said was that Neymar's popularity was almost over. His skills and performance during his move to a new club dropped drastically and he was even beaten by young players. The Arab League is not that strict. His outstanding performance could have faded. If you keep him in the long term, it would be a waste of time.
It would be better to look for a replacement who is more worthy of investment who can make a lot of difference to the club. I think that when recruiting Neymar you have to think carefully considering that Neymar is prone to injury.
Neymar barely played few games in Saudi Pro League and passed most of the time injured. The only thing that might make Al-Hilal gets a profit from it is his name and popularity. Same for PSG, he helped them more with his name rather than the goals he made.
Neymar surprising move to PSG from Barcelona made him fade slowly. He was like a legend there and things started getting worse for him ever since.
I doubt big teams will try to persuade him and he will remain in Santos unless he gets a chance to join Messi in MLS