This is the 7482nd most frequent Russian word.
действуйте
"Act" or "Take action."
Here, 'дейтсвуйте' is used as an imperative verb form, encouraging action and decisiveness.
Дейтсвуйте решительно, чтобы достичь своей цели.
Act decisively to achieve your goal.
In this sentence, 'дейтсвуйте' is applied to suggest a course of action upon affirmation of readiness.
Если вы уверены в своём плане, то действуйте.
If you are confident in your plan, then act.
Here, 'действовать' is utilized as an infinitive verb, while its imperative variant could similarly be implied.