Big projects take time and energy.
It is natural to rest after finishing such a project.
One should definitely do it.
But we should be wary of a short break turning into long periods without another significant project.
It makes it harder to retain what you learn because in the absence of an ongoing project you won’t have anything to apply it to.
A better choice is to get rest after a major project and not wait too long before starting another. This way you’ll learn effortlessly and grow without stagnation.