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The opportunities aspect isn't enough I think not enough cross were to him since he arrived at realmadrid, I did watch some of realmadrid games and I noticed that though that didn't still justify his is performance recently as it seem to be fair though but not as how he used to when he was at PSGnad like you said his performance at World Cup, don't really what's up with that actually because I some him receive some clear chance to make a goal happen but he missed them .
Maybe he still hasn't get used to it :)or there's just totally something wrong with him recently.
In my opinion, Mbappe still needs time to adapt, at Real Madrid everything seems different. Mbappe is the main finisher at PSG, the variety of attacks built will prioritize him as the executor. At Real Madrid, Ancelotti applies a different strategy, it seems that when the chemistry has started to form intensely, Mbappe will appear sharp again. The competitive level of the League and the different cultures may also be other obstacles for Mbappe. There is nothing wrong with Mbappe, he is a player who can make a difference in the outcome of the match.