So magic exists, or used to anyway.
Let's back up.
So let us say that all mages are conmen of sorts, and back during the Renaissance a mage had an idea. What if this science shit was real?
Because in this world it isn't. Physics don't really work that way.
Machines exist purely because he conned people into believing they did work. And all the belief in magic, fairies, demons, and everything else disappeared. And so it went. And every year practicing magic became harder and harder. This old conman created what is now known as the technocracy. Not by the man on street mind you, no only those in the know are even aware of the ridiculous origins of "science".
But so it went until the modern day. Where you the storyteller and player come in. You are a mage. A practitioner of that which everyone can tell you isn't real. And so it's tough. But you keep on. Sabotaging technocracy projects, engaging other sorcerers. Gaining belief. Whatever.