Al Nassr doing fine at AFC, maybe they should look into that a bit more, if they win anything, that would be the only thing they could win. But even then, I am not really seeing them doing that much better to be fair, we are seeing them not be that great.
Ronaldo is not regretting doing terrible, dude has made 500 million euro total from the 2.5 seasons he played here, why would he be upset about losing, that is not that important. So much so that for the 2.5 seasons he has been here, they have been losing all the time, not getting any better players, and other teams are doing much better, but he agreed to stay one more season in exchange of 180 million euro plus 5% of the club, so he clearly only cares about the money anyways, and why would he care about anything else, it's a job.
Unlike their performance in the Saudi Pro League this current campaign, Al Nassr have been exceptionally impressive in the AFC Champions League competition and I think I totally agree with your assertion that they should focus more in the continental competition. Considering the quality of players at their disposal which Cristiano Ronaldo is included, I think they can go all the way win the AFC Champions League but that'll demand high determination and strong mentality from the players.
Now talking about the money Cristiano Ronaldo is earning at the club, I think he deserves every penny he's received because of his incredible contributions and impacts on the team. He's been impressive for them and have used his influence to put them on the global map.