You can always do cadence drills.
get warmed up good, then shift to an easier gear and spin as fast as you can; until you start bouncing on the saddle,
then back off, just a hair; Maintain that for as long as you can, (it won't be long).
Recover at your normal pace, and then do it again.
Over time you will increse your normal cadence.
Everyone is not the same. Some will naturally be higher and some lower.
It takes some work to improve.