He should be the third best player when they finally awards the best players in the world after Lionel Messi, and Erling Haaland when they finally get to announce the Ballon d'or winner next year January.
Kylian Mbappe can finally take hisngame to another level when he finally leaves League One Giants. Real Madrid are hot favorites for him and I'm certain landing as a Real Madrid players once his contract comes to conclusion with PSG would be done ASAP.
With Real Madrid, if the club builds around him he can replicate Cristiano Ronaldo to an extent but Lionel Messi? He can't be easily replaced.
For awhile, Kylian Mbappe have final decision will leave Ligue 1 next season after not extending contract with PSG will over next season but I doubt that final decision or change later for renewing contract with PSG. Did you remember before when Mbappe contract will be over but in deadline window transfer closing he reached agreement extended contract two years later with PSG after fantastic offering from management. Depend with Kylian Mbappe priority he will push up his level career and moving to Real Madrid is the best option or keep staying with PSG and actually he will get another chance with fantastic offering and highest salary payment.
Looking with his rival Haaland have won Champion League I think Mbappe have move to Real Madrid if want to win Champion League tittle because have been several years with PSG but never winning yet.