If you are talking about support for the forward, then I have always said that Real was one of the best teams in this regard, by the way, things were definitely not worse in PSG. If you evaluate Real's midfield, they only lost Kroos, who ended his career
Real Madrid have many good midfielders and at two swings, they have Vinicius and Rodrygo, one of best swing attacking players now. Losing Kroos can decrease attacking power of Real Madrid especially in their ball possession ability but Kroos with his old age, could not play stably with good performances in all matches. The last season is like magic one for Kroos but if he has been still in Real Madrid as a player, he would have performed terribly in this season. We can not certainly know about performances of old players and Kroos' ex-team mate in the midfield, Casemiro is good example of quick decrease in performances.
If Ancelotti is so dependent on one player, then he should change something in the team, because, for example, Guardiola has lost very important players many times, but always found a way out of the situation.
Ancelotti can handle this issue well and Real Madrid have their good strategy to replace important star players too. Their preparation started seasons ago with young players like Valverde, Camavinga and Tchouameni in their midfield.