I believe that it is going to be a trouble for him and there is really no way to recover from there at all. The best thing they can do right now would be making sure that Neymar finishes his contract there, or (I know it is near impossible) find a team to get him. Even terminating his contract for cheaper than what he is owed would be fine.
Al-Hilal actually are very disappointed with their bet on Neymar and big money spent to this player while in return they got very limited contributions from him. With latest things around Neymar, chance for him to return to Europe is very small too and maybe he will have to look for another club in Saudi Professional League or return to his home land Brazil to play very last seasons in his career.
Neymar Jr. was one of the best forwards among the young emerging players. But with the change of time, he seems to have lost himself i.e. wasted his brilliant career. Maybe the number of injuries is more responsible for this because he has been injured more than the number of matches he has played.
The Brazilian forward was bought by Saudi club Al Hilal for a record fee mainly to bolster their squad. However, Neymar has not been able to play many matches since joining the club, he has not been able to participate in any matches for Al Hilal for the past one year. But according to sources in Saudi Arabia, Neymar Jr. is now fully healthy and now he is working to maintain his fitness, maybe we will see him on the field for Al Hilal very soon.