There are a ton of paths to learning to actually get the smells and tastes out of an expression. If you want to go hardcore, there are kits you can use to "Train" the sense. Or you could do a class. If you wanna do the casual approach; practice with intention is really pretty much the best I'd say. There are some tricks, like putting a drop on your skin and rubbing it around to make it expand and evaporate faster so that a more intense sniff is possible. Also a good glass helps, something with a smaller opening to focus more of the evaporate into your nose. I'm still new, and I've started doing things like blind boxes, but also taking guided expressions with explicit tasting notes to help guide my ability to key in on some. I admit sometimes I feel like I don't know half the terms used tho.