This current Juventus team are one of the weak teams they've had in about five years coupled with poor management on the part of the team's front office
Last season, Sarri’s poor tactics and lack of ability to make things happen led to the termination of his appointment with the installation of Andrea Pirlo to cover up for the lapses of Sarri, which I believe winning UCL is one of the reasons
Juventus have not been lucky with UCL. Not only that, they have worse winning percentage in UCL finals compared to other teams. They have been runners-up and have the honors of losing seven UCL finals.
Juventus believed Ronaldo would break the Jinx of their UCL drought and they imported him from Madrid. Two seasons gone yet the old Ronaldo is unable to make that happen
Ronaldo can't achieve that feat with the quality of players Juventus have. A weak team that comprises of old Gonzalo Higuain, inconsistent Costa or a midfield comprised of Rabiot Miralem Pjanic
Ronaldo made that happen in Madrid not because Zidane was a good coach but because he was playing alongside great players like Gareth Bale, Luca Modric and Karim Benzema. These guys made things easy for Ronaldo and that was why the squad won UCL three times in a succession
Their dreams of Ronaldo winning UCL for them should be buried