What made Fourth Wing a Big hit ?

So what makes Fourth Wing a commercial success?

Fourth Wing a fantasy romance Seires has garnered massive success within the book genre. Information about an Amazon is already being planned and the like . And the book blew up relatively quickly. It's sequel having premierd a while ago and Third instalment coming soon.

I'd like to deposit what makes it successful within its sphere. Having seen a lot of readers flat out admit it got them into fantasy it seems the book strengths lie at being really accessible.

But like other more famous fantasy's Seires has a lot of side lore within the book for readers to ponder on . Characters and inner factions the books always seem to add a new mystery or angle .

Id argue while it's main character may be rather simple, they are very determined and that energy does transfer over to the reader to continue pushing further along the pages .

Add in Dragons Bieng central and crucial to the plot it's a remarkable strength it just knows what it wants to be and succeeds at it .

In any case what are your reasonings for the books success.