As I recall last season Arda was almost loaned to Milan and indeed initially Milan also offered several seasons for the young player. But for some reason he remained in Madrid. And in my opinion the rumors regarding the departure of Arda and Endrick seem like they will only be loaned to other teams to give them experience. Because I also believe that Madrid actually needs the two young players in the future. It's just that currently Madrid has no other choice but to keep the old players to pursue titles in several competitions.
Madrid certainly does not want to lose valuable assets like these two, talented young players who will not be easy for them to find in the next few years.
Currently, they have not yet got a regular place in Ancelotti's team. But they seem to be allowed to play and indeed they can show good performance. It's just that there are more senior players with experience and suitability to implement Ancelotti's strategy. That makes it easier for them to implement the strategy in the current team situation.
Madrid's best option is to loan them to other big clubs. But it all depends on the players themselves, they will get an offer if they want to play outside then they will be given the opportunity. But if they want to be in Madrid, then they have to patiently wait for their stage.