Need to know:
- type of wine
- recipe
- what you have done so far - details matter - yeast, fermentation conditions, etc
Without that, we're just guessing. That said, because you said the wine is "very clear", we might guess it is a white wine. My short list of white wine tweaks:
- citrus - specifically grapefruit zest - adds a nonspecific citrus element
- backsweetening with sugar - can bring out fruit elements
- glycerin - adds body, element of sweetness, non-fermentable
- fruit secondary infusion - passion fruit, lychee come to mind
- flower secondary infusion - it's almost elderflower season, but I've also done plumeria and others; don't overdo it, easy to ruin a wine this way
- backsweeten with fruit syrup - grape concentrate, but also any heavy syrup from a can of "white" fruit - lychee, pear, etc.
- oak - maybe only for Chardonnay style
- sometimes the absence of flavor is "flat" or "flabby" wine which really just needs acid - generally tartaric or citric or a mix.