Real Madrid, who ended the season by only signing Kylian Mbappé this year, is struggling with many injuries. Maybe they can make transfers to replace some players who are injured for a long time. For example, they can get a player instead of Carvajal. Since he ended the season, he will not play any more this season. Also, since the Champions League is very important for Real Madrid, they will have set their minds on being successful on this platform. They are also doing well in the Spanish league, but they are behind Barcelona. However, they were completely disappointing in the Champions League.
For the time being in the two important competitions La Liga and the Champions League, Madrid performance is far below its standard as the king of Europe.
I also think that Real Madrid should be willing to take advantage of the moment in the January transfer market because besides being able to help teams that are experiencing injuries to their important players, Real Madrid this season is really not strong enough in their midfield so they often have difficulty in creating their best passes in every match. So it's not wrong from what you said because Madrid really has to fix some lines that are still weak by relying on new recruitment in January.
The midfield is very important because it is the transition of the ball to be effective to the striker and now Madrid does not have a figure who is able to be a balancer. Bellingham, Valverde, Tchuameni, and Camavinga have not been able to make a good transition. Modric is no longer the Modric we used to know, he is old and has lost his prime.