The Witcher 3 story was one of the best game stories out there IMHO, but it gets off to a slow start. That slow start can be VERY slow, if you are doing lots of the side quests to start with.
If you haven't gotten through the 1st act, I'd recommend giving it another try. (After each major act, there's usually a narrated story board scene, where you see how some of the choices you made effect the outcome, for good or bad.)
I'd also recommend ignoring the side quests initially and just progress along the main quest-line. It will move you into the meatier part of the story pretty quickly that way.
(Once the story hooked me, then I wanted to spend more time in the world doing the side quests.)
If you haven't gotten through the 1st act, I'd recommend giving it another try. (After each major act, there's usually a narrated story board scene, where you see how some of the choices you made effect the outcome, for good or bad.)
I'd also recommend ignoring the side quests initially and just progress along the main quest-line. It will move you into the meatier part of the story pretty quickly that way.
(Once the story hooked me, then I wanted to spend more time in the world doing the side quests.)