I'm just now recovering from burnout myself. I'm back into the game, but taking my return slow.

Honestly, likes others have said, the simplest advice is just to step away from the game as much as possible. I only logged in about 1.5 times per day for a few minutes so I could do my gardening, because I have nobody to do it for me, and it still kept me making pretty good gil with very little effort. If it wasn't for gardening, I would have just stopped logging in completely, which would have been better.

Don't even log in for dailies. They're going to feel like a chore, and just put you off from the game. Just do something else you enjoy. In my case, I played other games I've been putting off because of 14, games from the past that I never got a chance to play, increased the amount of anime I watch, and kept up better on gaming news that I had fallen behind on.

My break from the game was for a little over two weeks. I think it's a decent amount of a break, but if you need more, take longer.