Football is more than money. I don't know exactly what is going on within Al Nassr but they may have some dressing room problems, maybe the alchemy among the players is not good, maybe they don't like the manager... There are a ton of different reasons. And having someone like Ronaldo in your team may be both a bless and a curse at the same time because now he is more than a player, he takes decisions for the team.
Maybe that's the problem because some players would feel like he's giving more preferential treatment and gets jealous thereby causing dressing room problems for the team am just saying though cause I might be wrong, money is not a problem for Al-Nassr, they just need a coach that can manage the team and put them to order.
I always got the impression that Al Nassr is too Ronaldo-centric while the other teams that have many very good players but no real super stars (like Ronaldo) simply play more as an actual team, helping each other. In Al Nassr everything has to go through Ronaldo who, let's not forget, even owns 15% of the club. It's quite a unique situation.
We have different views on this matter. Indeed Ronaldo has always been the center of attention not only at Al Nassr but also when he played for Real Madrid and Juventus. I even remember Zidane's words when he was coaching Real Madrid "If you want to win, pass the ball to Ronaldo." So, it's not wrong to have a player like Ronaldo on the team. However Al Nassr always fails to win trophies because their defense and goalkeeping are weak. This is my opinion.
Because many goals are meaningless when Al Nassr has a weak defense and lacks strong motivation. I actually see Ronaldo as very ambitious to win trophies with Al Nassr, as evidenced by his constant scoring. But again, when the defense is weak, it's useless. Al Nassr should recognize this weakness. When the transfer window opens, they should be enthusiastic about bringing in defenders, not forwards. Al Nassr must forget their past failures, they must focus this season so they can win the SPL trophy.
I don't think it's possible to make a comparison between a 28-32 years old Ronaldo playing in Real Madrid at the peak of his career and this Ronaldo, who is 40 years old, and plays in Saudi Arabia. The players in Madrid had a certain type of mentality, they knew how to play; in Saudi Arabia for many players, especially the Arab ones, they idea is to pass the ball to Ronaldo and see what happens. That is not a scheme, it's not a plan.
Regarding the defenders, I think there is a limit of foreign players so they prefer to spend money for strikers and wings rather than defenders. They should get at least one great center back.