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Toni Kroos was one midfielder that Real Madrid will not forget in a hurry due to how he controlled the midfield alongside Luka Modric but after Kroos left Madrid, Modric became so weak because he hasn't seen another player that can match up the role that Kroos played in the midfield. Not only Mbappe and Bellingham but Vinicius is included in this circle because the three players lack the chemistry of understanding amongst themselves because if they got to understand themselves, the midfield wouldn't have been much of a problem.
In the current Madrid team, that i got to understand that when there is too many quality players in a team, it leads to some kind of confusion and lack of cooperation in the team because each of them feels bigger than the others which often leads to poor performance of the team but since Madrid is an elite club, their coach knows how to manage the team and still get good results so the lack of understanding isn't that visible because the coach knows how to do his job perfectly.
Toni Kroos was an important midfielder for Real Madrid before he retired. He has helped the team achieve great success in the Champions League and La Liga, as well as in various other competitions. It would not be surprising if Real Madrid's performance changed without him and he is a midfielder who is very difficult to replace. It is not easy to maintain the team's performance when several important players leave the squad regardless of injury or retirement, but over time the coach will find the right replacement.
At the moment it is difficult for Ancelotti to find a midfielder like Kross, but in the coming season they will definitely try to get a player like that again. I am sure that Real Madrid, with its financial strength and big name, will easily recruit any player they are looking for, even with or without a fee.