I've been thinking of a few ideas for characters and concepts, and I am aiming to create a massive world: a world with its own deep history and rich lore. However, I feel like this is difficult to do, because of the fact that if I based this world in sort of a fantasy realm, it would be too similar to things like Lord Of The Rings and Game Of Thrones, and if I base it in a science fiction realm, it would be too similar to things like Star Wars. So my question is, how do I go about creating a completely original world or even concept? I know it can't really be explained that easily, but maybe I could get some ideas about ways to get something original and stay away from overused concepts. Thanks.
---Thank you guys for responding, but I would like to add: yes, I feel that I do have original concepts and characters to add to this world, and no, I'm not looking for commercial success. I'm doing this for the fun of it, and I'm really trying to set it in a place that's pretty original and free of cheap clichés. I feel like there's too many fantasy/medieval and space/futuristic concepts and stories, and I want to make something free of those, something original.