CR7's impact on the Saudi League is huge, that cannot be denied. In fact, they begged him to re-sign with Al Nassr. I'm sure many of us here follow the Arab League just because he's there and many other famous players. If CR7 had left the Saudi League, it would be a fact that they wouldn't have paid as much attention to him as they do now.
His contributions for Al Nassr and Saudi Professional League is huge in expansion to other nations including European nations that have many fans of Cristinao Ronaldo or knew him well after about two decades of his career in some biggest leagues in Europe.
When Cristiano moved to Saudi Professional League, may European people started to follow this league and Al Nassr, watch full matches or match highlights. These contributions are huge and undeniable but in Saudi Arabia only, Cristiano Ronaldo failed to make considerae changes because locals mostly don't care about football.