Progress isn't random. It's observable, measurable and predictable. Like any unit of energy, it has the anatomy of a wave, with crests and troughs, which spiral through an observable frequency of releasing energy (work) and storing energy (recovery).
The science of progress, we can know.
The art of progress, we must feel.
Good practice gives you the science or the art.
Great practice presents you both!
At first, you'll need more recovery, but then, you'll find your rhythm, and as long as you keep consistent, progress will continue to spiral upward.