"kept revising" is a correct and usable phrase in written English. It is typically used as a verb meaning to review or make changes to something, often with the intention of making it better. For example, "I kept revising my essay until I was satisfied with the result."
He kept revising them in vain hopes of their acceptance.
Over the last few months, she kept revising the obituary.
He kept revising the forward-looking final chapter almost until publication day.
At Merrill, Mr. O'Neal announced huge write-downs — and then kept revising them higher.
The Halls met with their critics over the course of two years, and Mr. Gehry kept revising his designs.
Yet in the 25 years I have been intermittently watching it, it has kept revising several key features of its style: wrists, knees, chins, basic stance, turnout, phrasing.
We keep revising our histories.
But Foton keeps revising production plans and delaying construction.
I want this "Faust" to keep revising itself and evolving.
He keeps revising later editions to fix a period or a single word".
Tradition-bound though the Kirov certainly seems, it — admirably — keeps revising, correcting, reworking even basic academic features of its style.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK