Ronaldo have some rumours to go back to Manchester United now that Erik Ten Hag is gone. With his contract ending this summer, that means he will be free agent and to be fair United do not have that many great strikers. They have Hojlund and Zirzkee, both of which are such superior strikers that Amorim is considering using Rashford at striker instead. This is why bringing Ronaldo back to United would be a great move and could benefit them.
However, that wouldn't really be a great move for Ronaldo at all, much more pressure, less goals, makes it harder to reach 1000 goals, and also less money, there isn't really any benefit to Ronaldo if this happens. And even worse for Al Nassr as well, we would see them not do great because they want Ronaldo a lot, it's even more than just want, they really need Ronaldo, without him, not only the team would fail and fall, but also the league would lose all their attention as well. They only saw any attention because of this one move.
Manchester United is the first place where the mega star shined, previously people did not know Ronaldo until finally Sir Alex Ferguson brought him to Manchester United, and he managed to win many titles and awards there. MU is the first place he shone, then MU will also be the place where he returns and ends his career. and about the 1000 goals that have not been achieved, in my opinion even though it has not been achieved, at least Ronaldo has become the player with the most goals in the world.
Ronaldo has everything, and when it comes to money, he has various businesses. Returning to MU, he will not get a salary as big as when he played at Al Nassr, but MU can be a beautiful place to enjoy the last seasons before retiring. As a form of respect and love for the club that once helped make his name great, I think salary should not be a problem for the mega star.