Try a dawn excursion to beat the crowds, watch light spill over the caldera
https://charliekzws842.urbanvellum.com/posts/how-to-find-a-tour-on-santorini-insider-tips-for-santorini-day-tours-and-vip-experiences-3
Try a first light tour to beat the crowds, watch gentle spill over the caldera, and seize serene streets until now the island wakes up.