I have played many mmos over the years, some of them a whole lot more than this game, but this happens in every single one of them. People get burned out playing the same game for months, or years. It's kind of natural. I'm not saying you should or shouldn't be burned out (I'm not you), but I am saying it may not be the game itself....for most people it just happens. You may actually NEED to play something else for a while...something new and fresh to you.

I recently came back to this game (about 4 months ago), after leaving a month into it's release (ARR, not 1.0), and am enjoying everything about it. To be honest I think it's the best mmo currently out, and as far as different things to do to pass time in the game, there really is only 1 game that surpasses it. But, when a game has been out for 12 years it SHOULD have a lot more things to do. I may get burned out eventually, but my play time is such that there are things I don't even have unlocked yet (looking at you challenge log), so that could be a long time from now.

Good luck to you, and hopefully you return after you get your "rest" from FFXIV.