@ami_angelwings Wanna give a shout out to Skullduggery Pleasant for the way it handles stuff like this.
-Immortality is achievable so a lot of the dark ages mystics have spent centuries adapting to surveillance.
-A lot of modern mystics come across as nerdy hobbyists enjoying a secret lifestyle
-Governments communicate with magic ones and agree to look the other way.

@ami_angelwings Just about every secret org in YA fiction unless it's very specifically being played for laughs. Just a whole ass genre of beautiful, often long haired and long coated people who somehow exist on the fringes of society who're unaccountably able to Go Anywhere Important and Do Incredibly Important things, all apparently walking normal ass streets unsmiling waiting for the chosen ones to mentor without anyone side eyeing them like "who is this weird Amish metal head?"