Make the best of the moment and try not to perseverate on the past or worry about the future.
From the psychcentral.com
In this video clip, Barkley says we perseverate, not hyperfocus.
From the blogs.psychcentral.com
Get a pencil and paper and prepare to perseverate in print.
From the us.cnn.com
So, please do not perseverate in your edit-war.
From the en.wikipedia.org
Leave it to our ever-so-smart cousins across the pond to pontificate and perseverate on someone's underwear.
From the guardian.co.uk
Patients with OFC dysfunction, however, continue to perseverate with the bad decks, sometimes even though they know that they are losing money overall.
From the en.wikipedia.org
Accordingly, patients with jargon aphasia often use neologisms, and may perseverate if they try to replace the words they can't find with sounds.
From the en.wikipedia.org
More examples
Psychology: repeat a response after the cessation of the original stimulus; "The subjects in this study perseverated"
(perseveration) the tendency for a memory or idea to persist or recur without any apparent stimulus for it
(perseveration) perseverance: the act of persisting or persevering; continuing or repeating behavior; "his perseveration continued to the point where it was no longer appropriate"
Perseveration is the repetition of a particular response, such as a word, phrase, or gesture, despite the absence or cessation of a stimulus, usually caused by brain injury or other organic disorder. ...
Describing the behavior, generally displayed by those with various developmental disabilities, of extraordinary, exclusive and lasting obsession to a detail or occurrence others consider minor; to repeat or continue a pattern
(Perseveration) Repetitive movement or speech, or sticking to one idea or task
(Perseveration) Persistent repetition of an activity.
(Perseveration) A disturbance of thought form, where responses are seen to focus on the previous thought or response, despite the introduction of a new stimulus.
(Perseveration) A term used to describe an autistic person's fixation on something. For example, an autistic Godzilla fan might spend hours on the internet looking at pictures of Godzilla, write Godzilla fan fiction, and launch into a monologue about Godzilla movies at any opportunity.