I believe the sooner Mbappe joins Real Madrid, the quicker his success will come. Because Messi and Ronaldo are outside of Europe, Mbappe now has a big chance to win the Ballon d'Or. Because if a player of Mbappe's caliber had some support from the team, he would already have a Ballon d'Or next to his name. Mbappe should join Real Madrid this season instead of waiting for next season if there are not too many problems. Because if Mbappe joins Real Madrid, he will get a great support from the team which will help him a lot to win the Ballon d'Or in the future.
Maybe, I think Real Madrid can make that dream come true for Mbappe, but of course it won't happen instantly. There is competition for being the best and for that award, so I don't think Mbappe will be the only one who will have a chance. Messi may still win the award (at least one more time), but the era of Messi and Ronaldo will be over soon after they leave Europe.
Haaland is one of the contenders, several Brazilian players will also be on the shortlist. So don't just think Mbappe can win it because there are many competitors who also have the chance to get it if they succeed in their respective leagues and also in Europe.