Last season he also experienced the same condition where there were several important players who were injured so they had to bring in several substitutes. But talking about the form of the game Real Madrid managed to give their best by winning several titles as targeted by Ancelotti. Currently the form of the game that has not been seen is more consistent and I think Ancelotti needs to see the position that is the problem so that he can improve it slowly.
Now their strength is also so complete where the front line is getting better than before but in terms of collective play it has not been seen perfectly. I am sure that slowly Ancelotti will be able to overcome the problem and they will return to their best form and may need time to perfect the problem.
Ancelotti plays a very simple game, he is not like Pep Guardiola, and because of that he will not have that much hard time adjusting any player at any position. Even with injuries, if you just take any player in the squad that can replace the injured ones, and put them in the game, they will automatically play the way they should be, there is no steep learning curve for the players.
In contrast, at Pep system you would have to train a lot and play a few games to get adjusted to how to play his system, it's both tiki-take like he used at Barcelona, but now he plays a bit more from the middle instead of from the wings compared to old days, and he is trying to not do gegenpress too much like he used to as well. Ancelotti has none of that, he just defends, and then passes out to fast wingers and strikers, that's it, end of story. They should be fine.