I wonder how fleshed out any of those games are. It sounds like you have a lot of very shallow ideas (largely based around somebody else's, namely, Square's) instead of a few good, original ones. And if you're telling me you can't create something, I'd say you have no business creating anything. I mean, if it were something really specific, yeah i get that. not everybody can write a good mystery, or wants to pen a fantasy, but if you ask me to write a long/short/epic horror story, or a horror story that has nothing at all to do with previous horror stories I've written, I can do that.
Saying that you can't write anything self-contained, that you can only create on the grand or epic scale, is a serious shortcoming and weakness, and show the immaturity of your ability. That, or your unwillingness to let go of what you have already cobbled together.
I know all about team Ivalice, how Vagrant Story, FF12, FF Tactics, Tactics Advance, and a few other bits all take place on the same planet. You using that as some excuse is just that: you're making an excuse. If you're honestly telling me that you cannot create anything outside of the one world you've made, then I'm telling you that you're never going to grow as a creator. You're never going to improve, or expand your creative horizons. you'll be in your forties wondering why nobody wants to play in the one world you've made.
Stephen King once wrote that sometimes you need to "Murder you darlings." What that means is that you may love an idea, adore it, weep over the thought of losing it, but sometimes it just isn't good. You need to let it go, let it die, and move on. Let's be honest, you're world, no matter what you call it, is not original. you've thrown in other intellectual properties like moogles and Gil, and called it your own setting. If you keep clinging to that, your "darling" then you're screwed.
But, if you can manage to let it go, even just for a little while, say a year or two, and do something totally unrelated, then maybe you've got half a chance.
EDIT- Icey, I may be (what I think is) brutally honest and harsh with you, but at least I will be honest. The third of you that thinks that is somebody from Square is wrong. If you really want to be the butt of an obvious forum troll, then go for it, but it's just somebody messing with you.