失敗をいつまでも___ないでください。
Q. Which verb means 'don't keep worrying about it (deliberately)'?
Translation
Please don't keep dwelling on the mistake.
Explanation
気にする is volitional worrying you can be told to stop: 気にしないでください. 気になる is an involuntary state ('it bothers me') and resists the imperative; 気がつく means to notice.