One of the recipes to meet a dual, by the manual, is to get out of your comfort zone. Do something you've never done before, or just something you don't normally do, and the people you'll meet on your way, the ones who will naturally come in your help, will probably be duals.
This is the theory, in practice you can meet a dual at every corner of the street, and chances are you've already met tons of duals before, but failed to recognize them or pay attention to them. After all, the recommendation to get out of your comfort zone is a good way to establish a good relationship with anyone you meet, not just duals. It's been proven that when we date someone for the first time, in a "dangerous" or just "thrilling" scenario, there's tons of adrenaline involved, and this helps to open up, rely on the other, get vulnerable and so to establish a strong connection. For example, going to the roller-coaster on a first date is a classic
Sorry for these random points. My tip is, don't get obsessed about finding a SEE, just live your life and get what comes. SEEs should be naturally attracted to you for what you are, and you're lucky that they like doing the first moves, so yeah... you might meet one sooner than you wish.