즐기다 is enjoying something, and what comes before with -아/어 usually says in what state you enjoy it: 다 같이 모여 즐기는 마지막 아침 'a last morning everyone enjoys together', 하나가 되어 즐기는 모습 'enjoying it as one', 이 순간에만 집중해 즐겨주세요 'focus on this moment and enjoy it'. On its own the repeated imperative 즐겨 즐겨 is 'just enjoy it', said to someone taking things too seriously.