I just want to put this out here, to ponder...it's essentially a skill to be able to juggle and take in new jargon and stuff. It's something you learn. I learned it as a child, so it's second nature to me--but there was absolutely a time when I struggled!
So the question is: Do you want to develop that skill? (You don't have to answer me, I'm just proposing the question so you can ponder it.) I'm assuming here when you say the complexity is what puts you off, that this is accurate. And maybe it is. But there's a bit of a slog initially when reading SFF where you have to power through to gain the skill to follow these things--you're literally training your mind to take in new data in a way that doesn't much happen outside of SFF.
But also...what if the reason you bounced off the books listed is something else? What if it's not complexity, but the delivery? The style of narration or prose? A lot of the works you list MANY people bounce off, not due to complexity but due to the authors' voice and delivery.
I myself can't get into WoT or the book version of Game of Thrones or Foundation. I can't get into Tolkien either. Which is an abject sin in some circles!
But it's not because those books are complicated. Or because of the jargon. I'm fine with both in many other books, and disliking certain well-known behemoths of SFF doesn't negate that I read things like The Quantum Thief by Hannu Rajaniemi (which was pretty darn confusing and complicated) or Gideon the Ninth. Or all the stuff I read as a kid.
It's because the specific writing style turns me off. Asimov, for example, is kinda known for his cardboard characters. Tolkien world-builds like an academic, and a lot of his stuff is a huge slog like much dry research in academia. Wheel of Time likewise doesn't have that "something" in style or voice to make his worldbuilding engaging, nor does George R. R. Martin's Game of Thrones.
But I am a huge fan of authors who make big, complicated worlds who have a more interesting/engaging way of presenting what they have created. It's not the complexity or jargon that puts me off in those other books, it's the writing style.
Maybe it's the same with you?