Not only it wasn't just "not well known" but it wasn't known at all, hell even right now there aren't that many fans on the stands and I think it's clear that we are going to make sure that we are dealing with something that is taking a bit of time for them to have this kind of result. So, the best way to move forward is the fact that Ronaldo and similar level of famous players should be bought.
There aren't any player as famous as Ronaldo of course, but you can get a few of them together to make one I guess. They are spending insane amount of money, over a billion, for the salaries of the league and that is why
I think that we are going to end up with Saudi league getting more and more famous in the end. One sad note that Ronaldo came in here and then couldn't win the title, that is looking like the worst part, he deserved to win one, he scored so many goals and did what he had to do but unfortunately they couldn't win a title and because of that he might actually retire without a title here. I mean he won that Asian cup whatever it was, but he didn't win any league titles and that must have felt quite bad for him as well. I think he could do much better on the long run if Al Hilal wasn't this good.
The Saudi Professional League is severely limited due to the simple fact that they are not part of the UEFA. You claim that they become more and more famous in the end. This is not the decisive metric. The decisive metric is where the people want to spend their money for broadcasting and other things. The UEFA has the Premier League, La Liga, Serie A, Bundesliga, and many other leagues are still better than the Saudi Pro League. Let's say popularity is a cake that can actually grow. If the Saudi Pro League gets major attention from 5% of the people in the world, do you think that they will draw attention away from UEFA competitions ever? Why? Who are going to be the opponents for teams from the Saudi Pro League? Where is all the hype gone that Ronaldo created for a moment?
Many players decided against going to Saudi Arabia despite amazing offers. Everyone wants to see Real Madrid vs. Barcelona or Manchester City vs. Bayern Munich. Who wants to see Central Coast vs. Buriram United? The people from there yes, but the people from there also want to see Real Madrid vs. Barcelona while the Barca and Real fans do not want to see the games from the AFC Champions League.
The UEFA is so far ahead that no matter what they do in the Asian area, they won't close the gap at all for the next five decades. Only if a dozen states decide to take tons of money and pimp their national leagues. But they would still have to convince South American and European players to go there. It's not enough to get some almost retired players like Ronaldo and some money grabbers. They would need the next Messi, Mbappe, Modric, Zidane, Robben, Ribery, Maldini, Buffon etc. That's when people from all over the world would start watching those games on a regular basis. Now it was only short term hype because of Ronaldo.