the last coach that had a great relationship with Ronaldo and could manage him without drama was Zidane. afterwards there have been Allegri, Sarri, Pirlo, Solskjaer, Ragnick and Erik Ten Haag, under all of them Ronaldo has been a diva that can't be touched and none of them were able to build a high-level team with Ronaldo.
I'd only consider signing Ronaldo if someone like Zidane or Ancelotti was coming as well. if we hire Tudor or another younger coach that has 0 chance of gaining the respect of Ronaldo, signing Ronaldo is a bad bad idea.