Honestly, Arda Güler has not played much at Real Madrid and if he continues like this it will take many years for him to start playing a lot and this could cause his skills to decline. In my opinion, he should think hard about the possibility of leaving Real Madrid and a good option would be Manchester City. I am a Liverpool fan but I think Arda Güler would not get much attention if he were at Liverpool. But I also doubt very much that he could replace Kevin De Bruyne or Salah, they are players with unique skills and Arda Güler also has his skills. If he stays at Real Madrid then he should be willing to wait at least 2 seasons sitting on the bench.
The competition for a place in the Real Madrid squad is fierce, but I think Arda Guler will get more playing time as time goes on. Being in a team with experienced players will help him develop quickly, considering his age, it seems like it is okay to be patient. Arda Guler arrival has increased Real Madrid fan base in Turkey, which will definitely benefit the team. Therefore, it seems that the management will not let Arda Guler go, unless they get other better substitutes. Manchester City and Liverpool are good options to consider, but if we look at Arda Guler physique, he is more suited to playing in La Liga.
Actually he got more playing time this season, he has played 7 times in La Liga, but it is not much for full time. but it is a good opportunity that he can get, because for players, no matter how many minutes in a match, it is very important for them to keep honing their game and also build their mentality.
But on the other hand, when he wants to get more playing time as a regular player, then the choice is to move to another club, the option as a loan player can be done. Because considering the competition at Real Madrid is very tight, so it is not easy to break into the main squad, especially since he is still young.