Since the word “revert” means “to go back”, it is unnecessary to use “back” with revert. Similarly it is unnecessary to use “back” with “return”. We often hear people say, “I returned back to Delhi in a week’s time.” The word “back” is not required in the sentence.
*The depressed young man reverted to smoking heavily. *Once she landed in the States, Renu reverted to her strange accent. *I returned home at six o’clock.