Sure, but he's still playing on multiple fronts to either get a place in a top European club or big money in a league like Saudi Arabia.
Knowing how ambitious he is, I dont understand how he has enough mental energy to do all this and not burn out psychologically. It's like an endless game with maximum stakes (plus millions of haters who try to hurt you for any reason and without) and he successfully leads it. Maybe he really is a machine?

A Cristiano Ronaldo is a player full of ambition and also he is a person who works very hard to make it happen. If no offers come from European clubs then the Arab league is an option for him. But we'll have to wait until the transfer window opens and he completes his mission in the World Cup.
I would also like to see him still in Europe rather than the Arab leagues but it will be an absolute decision for him. The reason is that Arab league clubs also don't play games in wanting the mega star, they have been chasing Cristiano Ronaldo from last season and offering fantastic salaries as well. If Cristiano Ronaldo prioritizes money, then this is the right time for him.
But I'm sure Cristiano Ronaldo puts money as his priority.I believe that you wanted to write "but i'm not sure..."

It would be funny if Ronaldo signed a contract, thus guaranteeing himself something like half a billion dollars, then found a co-investor and bought United

That would be a truly epic comeback. Ronaldo in his interview said that United needs to be updated. He could do it himself in this way. It sounds fantastic, but in fact such a scenario could be realized. I would like to know if Ronaldo has ambitions not only as an athlete but also as a businessman who runs his favorite club?