If you feel a need to increase your natural cadence, then I would suggest intervals at +5 to +10 rpm over your normal cadence at the same power. So basically a gear lower than you would normally ride at that power. This is easiest to achieve on an indoor Smart trainer. If you do enough of these intervals then the slightly higher cadence starts to feel more and more natural. Ramped cadence drills also tend to make your normal cadence feel "slow" afterwards.