Nah, Zelda games don’t typically save once you beat them. You get a little star on your save file, I think, but otherwise, it drops you back to the save right before you fought Ganon so you can do all the side quests if you want. (If you’re a completionist, good luck finding all 1000 Korok seeds.)

I found the first half of master mode to be really fun too. Eventually, you level up enough that it’s not that much harder but at first, you have to basically play in stealth mode and avoid fights or use trickery. (Eventually, you level up enough that it’s almost easier because the monsters are all stronger and it’s easier to get good weapons/shields.)

It keeps your last save before beating the boss I believe