In Game of Thrones S08E04,
Dany accompanies a few ships of unsullied on their way to King's Landing. While Jon and his army go by land, Dany has time for a detour to Dragonstone. To my understanding, Dragonstone has been deserted since they mined all the dragon glass and went north. In S08E04, they did nothing in Dragonstone except discussing the ambush led by Euron Greyjoy.
What did they want to achieve in Dragonstone in the first place?