He can try other clubs but it shouldn't be in the same league as that'll be disrespectful to the club he was playing for already. He tried to do the same thing when he wanted to join Manchester city but Manchester United didn't allow that to happen so they bought him when they didn't need him and it ending was bitter for both sides. The same thing might happen to Al Hilal. Not evey player that joins the rivals of his former clubs does well and Ronaldo is now too old to be taking those kind of risk before he spoils his football career among fans. I don't think Ronaldo is interested in any trophies that isn't international but what he's chasing now is his goals record.
I very much agree with you. But I believe that Ronaldo is a player who is quite loyal to the club he joined. He will not ruin his reputation just to go to a team that is Al-Nassr's rival. Al-Nassr and Al-hilal are like Real Madrid and Barcelona today. So it is quite unreasonable to imagine Cristiano Ronaldo moving to a rival team. And yes, Cristiano Ronaldo is currently only more focused on enjoying the remainder of his career. He can focus more on his own achievements while strengthening the current team. And last season Cristiano Ronaldo also managed to set a record for himself here. And everyone doesn't think it's wrong either. Everyone understands it.
For professional players like Ronaldo, money is not everything but rather a career that is more important for star players. It was all done because Ronaldo was just waiting for when he would retire at a late time when his career was still shining. So logically it would not be possible even if given a big offer but Ronaldo is a star player who can always be his reputation to remain known as a player who is very appreciative.