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Wasn't Master Mode available from the get go assuming you'd bought the DLC?
Though I'm just thinking and one of the things I disliked about TotK was the ability to over-rely on sages to take care of the larger battles. In Master Mode in BotW, I found it tricky enough with 4-5+ enemies simultaneously as they start healing before you had an opportunity to hit them again.
I'm not massively keen on the sages as a mechanic in general to be fair. I can never be bothered specifically activating and deactivating them as needed so I end up running around trying to find the one I actually want to activate or having Tulin inadvertently blow a bunch of collectibles away.
Still very much enjoy it to be fair, but with so much going on it's a tricky one to balance.
But you'd still have to run through on regular mode to unlock it. Also, I recall BotW's master mode only making a very few things difficult but a lot of things tedious.
The first game I played while taking a (probably permanent) break from TotK was Horizon: Zero Dawn (on PC - haven't had a Playstation in the house since a burglar relieved me of my PS3). That does have difficulty levels, but also offers much more meaningful variety in how you can choose to do things. Of course, now I'm drumming my fingers waiting for them to release Forbidden West on PC.