Toni Kroos' retirement is a sad moment for all Real Madrid fans but the decision has already been taken so everyone must respect it. It seems that Toni Kroos wants to end his career with a memorable good ending and doesn't want to end his story at another club other than Real Madrid.
Meanwhile, Luka Modric still wants to continue playing with Real Madrid, and if you look at the fact that he is willing to be paid whatever it takes, it seems that he is a person who has high principles and loyalty to Real Madrid. He could end up playing in MLS or the Saudi Pro League which could pay him handsomely at the moment, but it seems that is not the path Modric wants to take, at least for now.
Toni Kroos kept his word that he would stop playing football or retire while his game was still at the top and he didn't want to retire when he had to sit more on the bench, and he proved what he said to us now. because currently his game is still very good and he is an option for his club and country, that means that his game is still very good. And if we talk about his current age, then I don't think he is so old to continue playing.
Now even though many fans are sad, as you said they have to respect every decision that Toni Kroos takes to retire as a professional footballer. Even though the club and country still need his contribution, now we can't do anything because he has made his decision. It's not easy to find a player with Kroos' abilities, but I hope that players at Real Madrid and Germany can fill the void left by Kroos.