All fans hope that Mbappe can perform as well at PSG with Real Madrid. But right now, I think Mbappe is in the process of transitioning to a different playing pattern with a different coach and teammates. Mbappe is a good center forward and has speed, but Real Madrid does not have a game scheme that relies entirely on center forwards. Mbappe's finishing in some matches may not be good, but over time he will get back to his best performance.
Actually Kylian Mbappe performed not really bad for Real Madrid looking for his goals contribution until 9 games, but he needs time for adapting well and return back to his top perform by consistent scoring goals every match.
Actually Mbappe get helped by good team mates and many players potential create assists for him but until 9 matches Mbappe scored 5 goals and still dominance from penalty kick.
Absent on international break matches, I believe Kylian Mbappe on the top perform when facing Celta Vigo on this weekend and he has potential continue his goals scoring after not scoring goals last match. Have much time for Mbappe adapt well with Ancelotti tactician and recently his performed not really bad looking how many goals scoring comparison with his appearance for Real Madrid in last 9 games.
Mbappe is no longer the best version of himself. He has lost his usual calmness and is more tense when handling the ball.
But if it's not a decline in form, then where is Kylian Mbappe's problem? I see Kylian Mbappe having to adjust to the new situation at Real Madrid. I know La Liga is much more fierce than Ligue 1. But Mbappe must adapt himself if he is to reach a new level, otherwise oblivion will be something this player will face in the future. Remember, superstars like Lionel Messi or Cristiano Ronaldo do not have to play in one position and one team throughout their careers, but they have to constantly change their playing style to suit the surrounding circumstances. Those are the really good players, if he wants to be a goat he needs to try harder.