The reason why Real Madrid lose against Juventus is Real Madrid use a strategy where it depend on Bellingham as an attacking midfielder. They're more comfortable when the midfielder backing up other midfielder and working together.
But it's clear there are so many chances in Real Madrid, but their strikers weren't able to maximize it.
It is a new tactic made by Ancelotti, Real Madrid players need an adaptation. They are not used to 1 attacking midfielder and 2 center midfielders. They often used 1 defensive midfielders and 2 center midfielders. In this formation, Real Madrid defense is stronger. Now, by removing the defensive midfielder, their defense looks weaker. That's why Real Madrid got more conceded goals in the current friendly matches.
Sure, Real Madrid striker (Joselu) seems not convincing enough. Real Madrid must sign Mbappe to ensure that they have a deserve striker who can optimize shoot attempts. Real Madrid can't rely on Vinicius and Rodrygo only, they need another machine goal. Someone who has the similar capability as Benzema (a deserved replacement for Benzema).