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Arda Güler was not ready to join a team like Real Madrid at this age and now he is paying for his wrong decision. Güler had good performances and considering his age he was a young and talented player who could grow in the team where they could give him the chance to play but since he joined Real Madrid, they didn't give him the chance to show himself and that's not their mistake as I said before Güler joined Real Madrid one season sooner than he had to join and by doing this he put himself under more pressure.
I think the best thing they can do right now with Güler is to give this young player on loan to another team and give him the chance to play like this, then after one season, they can have a more experienced player who can have a better performance and more stability than we see right now.
Real Madrid are not used to forcing players of Arda Guller's age to play with the first team all season when they have more options of more qualified and experienced players. Real Madrid are certainly aware of Arda's wishes, but Ancelotti does not want to take big risks in many matches especially because they are always serious about winning them.
Arda is a player who has big ambitions to become an important player in the squad, but he needs more patience before he can be relied on in the main squad. Real Madrid might even loan him to another team next season to give him lots of playing minutes, which is what they usually do with other young players so they don't return to Real Madrid.