The best is for him to later join MLS is what I can think, but I do not think it is yet good time he should join.
That could prolly be his best option at the moment, in the summer it was rumored that a Saudi Arabian club wanted to sign him and the money on offer was outrageous, he might be better of taking such deals and move to a less competitive league, he will lose all of the spotlight, no doubt about that, but he will make an unbelievable amount of money in the process.
If Ronaldo only concern about money i think he will accept the offers from Saudi Arabian club because i am sure this club will offering him a lot of money as long as Ronaldo willing to moved but before retired he has personal ambition want to get at least once time European trophies and playing more in this competitions so that's why he refused the offers from several rich clubs but the current problem is there is no big clubs who willing to bought him although since last transfer window he linked to several clubs but it just only remains rumours
And i think he should be stop to making conflict with Ten Hag and showed his profesionalism because admitted or not Manchester United has growed his name to became an superstar player so it's his turn to help Manchester United to get the better results for upcoming matches besides that i heard too he potential will be played against Sheriff on Europa league this Thursday so he should be more focus for this match