If you tell us your recipe and such maybe we can help better but since you added fruit puree you've got some unfermented or unfermentable sugars that are keeping the gravity high. It probably needs more time to ferment out further but I wouldn't expect much. A starting gravity of 8 Brix isn't very high to start with and at best I think what you will end up with is 2 to 2.5% if you keep it in the fermentor for a couple more weeks.