Persian language setting

Hello, I am Persian and I would like to set up my phone fully in Persian as it’s my first language but when I go to the settings to put Persian, some apps are in Farsi like photos but almost nothing actually is, my phone is still in English and I can’t delete the English language to only put Farsi/persian. I have the iPhone 15 and thought maybe it would be fixed now but if anyone knows how I can put it as a real first language, please tell me!