Speaking of stamina, Luka Modric is still quite fit but has decreased from the previous season, and the playing opportunities that Ancelotti has given to Luka Modric have also decreased if look at the appearances of the 36-year-old player from the 20-21 to 21-22 season. But I have no doubt that I will see him again maybe in the next two seasons with Real Madrid, because Modrid has an important role as you said.
Talking about potential La Liga winners next season, maybe I'm a little doubtful, because on the other hand Barcelona as a rival also made changes in Xavi's hands.
Laliga title race is indeed difficult to predict because Barcelona, Real Madrid and Atletico Madrid have always been strong candidates for Laliga champions. other clubs may not have a chance to shake off their dominance. like Valencia who used to be strong competitors but in recent seasons they have not played well and their performance has dropped drastically. next season several big clubs began to clean up such as Barcelona, Real Madrid and Atletico Madrid.
My guess is that only Real Madrid and Barcelona will fight for the La Liga title next season. Atletico Madrid is not strong enough. And Atletico Madrid's management does not spend enough money to build their team. If they do not get a new striker next season, they will not be able to form a suitable team to fight for the title. This season we will only see the dominance of Barcelona and Real Madrid.