Thanks for creating this thread to help DD players on epicenter @Destroyer_KuroshioKaiGreat video that highlights the need for map awareness in addition to the capping situations for both teams.
DD's come into each battle with a long list of strengths and opportunities in which they can help their team succeed. Yet one mistake can lead said DD to be a a ripple in the water as it is sunk. This is multiplied in ranked when the numbers of ships are cut down even more than a standard random battle. @A_Burning_Sensationconcern over players not reading the available information even before the battle begins is a solid bit of concern and advice. If you do not understand who and what you are facing that can be a recipe for disaster.
If you are unfamiliar or just need a reminder on how best to "Read" or "take inventory" of the enemy's compisition@Ducky_shot put together a solid guide on a basic approach for this.