I'll be forthright: Improving your ability to smell various aromas in a glass of wine is not a major concern for most people. Correcting your friends by saying, "That's not blackberry you're smelling, it's blackcurrant" is less likely to engender respect and more likely to guarantee your disinvitation from the next soirée. Smelling better—with your nose, not your bodily aromas—is ultimately a personal endeavor.
The sole exception to this is in serious wine education, and for those who want to become wine nerds. There's also some layperson value to connecting aromas with wines: If you're preparing a dinner that includes mushrooms, green peppers, and bay leaves, someone appropriately trained might suggest that a Cabernet Franc, which echoes those aromas, could pair well with it. Enjoying and identifying wine revolves predominantly around your sense of smell. If you want to body-hack your way to a better one, try a wine aroma kit.
The concept is pretty simple: Break the wine world down to its most common aromas, then bottle the essences of those aromas into a series of small vials. You then use these vials to train your nose to more easily identify these aromas when they're mixed up in a glass of vino. Sniff the vials every day at random, quizzing yourself on each one, and soon you'll find you can catch a whiff of these scents even in a big goblet of mystery plonk. In theory, anyway.
Wine aroma kits are designed to go further than that, though. They don't just help you improve your sense of smell and aid your olfactory identification. The final trick is to use those aromas to help you blindly identify what type of wine you've been served. Admittedly, this is a bit of a...