I'm a bit similar to that, even if I'm reading like 8 books in tandem I always keep it to 1 fiction so I'm not hopping around to different stories. (I love fantasy too)

I'll read a lot of different topics that allow me to bounce around more.

For example, over the last few months I've had bitcoin, macroeconomics, chess, psychology, and diet related books all going at once. I'll finish them all, but just pick up whatever topic I'm most into in that moment.