I think Ronaldo wants to Alnassr Al Nassr management to sign in new players that can compete for the title next season, last season they messed up in the defense line and that's the area Ronald want the management to improve before he could sign any contract with the club.
Ronaldo always wants more quality players to improve the quality of Al Nassr squad. Even, he wants Al Nassr to sack Stefano Pioli (current coach) because he thinks Pioli's approach isn't suitable for Al Nassr players. Recently, we heard a rumor that Ronaldo wants some current players in Al Nassr to be kicked. Ronaldo may think those players have no capability to improve the performance of Al Nassr.
Reference: https://www.football365.com/news/cristiano-ronaldo-demands-al-nassr-sack-manager-axe-four-stars-requests-contractHe won't leave Saudi Arabia pro league, he would like to win a title with the club so the Euro move won't work. Ronaldo is not too old for Euro, he can still play in any league.
Since he is still unable to win a major trophy with Al Nassr, I am sure Ronaldo will stay at Al Nassr. He isn't a player who easily gives up and moves to a new team, he will keep struggling with Al Nassr to win a major trophy (especially SPL trophy). It is true that he may have a chance to play in Euro as long as he still can play regularly as a main player in Al Nassr and show good performance.