If its just a simple wine from fruit concentrate, my advice is to let it age atleast a few months, if still nothing then backsweeten and add a small amount of salt with you sugar[ im talking a couple pinches] salt helps bring flavors out in cooking and wine.
P1 Strawberry bannna melomel
p2 mixed berry cyser
p3 lemon ginger melomel
2 gallon fermenting kit is OTW!!!