I've been there before myself. Once you get this far along it's hard to coax any more attenuation because the ABV is already so high. You could try getting a big, active starter going and pitch that with some aeration, but I still don't think you're going to get much more out of it.
With the right acidity balance, you can possibly get as high as 1.050 FG to drink like a sweet dessert wine without being cloying. If you find a tart fruit juice with a low enough gravity (lemon, lime, unsweetened cranberry juice, or sour cherry juice, maybe), then you might just be able to blend them to taste and call it a day.