I'd step away from the androgynous look, bring in a main character, if he were a guy that is, and make him this grizzled vet who's got a hankering for kicking major ass, and not the girly guy who just might want to do something else with an ass.
I'd move away from the linear and go into the open world.
Allow the airships, cause it's Final Fantasy, it needs airships, to be piloted by the player, allowing him fun to roam, I used to do that with all the older FF games, up until 10, when that system was switched to a point and play.
Bring in the Job System, that was better then the Grid.
Make the characters unique and compelling, that doesn't mean make them look like every other jrpg character out there. Have the men look like men, and the women look like women, stop the androgyny in every game... or at least let the black guy be a real guy, Barrett comes to mind.
Listen to the voice actors, if they sound like they're bored, hire someone else, because in all honesty, if they're bored, we're going to be bored.
I haven't played FF since 10, when it got bad, which was a surprise because I thought 9 was bringing it back to the old school. In fact, remake 9 but with different characters, settings, story and all the sort of things we need changed in order to play the next game without too many similarities.