How we be aggressive is you have to smell the bad move if you think your opponent did something wrong. And then you try do punish your opponent. In a critical position, you will have to slow down and think about your opponent's intention. Also in the endgame you have to create a PASSED PAWN. In some endgame positions, you might need to sacrifice some material in the endgame and most importantly king activity is absolutely important like almost in any endgame position.
