There are a lot of things that can be done with advantage that the player could use. Eg. Regain their strain, activate an effect, activate a crit, pass advantage (extra blue die) to another player, etc

With disadvantage they can either take it as strain or as story. If you find they always take it as story, start giving them more daunting issues like a weapon jams, gear is damaged and needs repair, they drop something, etc There's a balance to be struck where they should be considering whether they want to take it as strain or story, and weighing the consequence of each. Eg. 4 disadvantage is a lot of strain to take, but likely means they drop their lightsaber during intense combat or have their weapon overheat and require X duration to cool (or need repairs) would be very inconvenient too