Yes I created and cloned a lot of ads, CPM dropped but sometimes still increased after 1-2 daysThis problem started few months ago, copying ad campaign from 1 campaign that works well but the results are opposite, increasing CPM almost failed. copy campaign and start with small budget, do you see there is always 1 in 10 campaigns that have good results?
I have also set up multiple campaigns and the CPM has changed significantlyTest new creatives more often and trim audiences that don’t convert. I’ve also noticed lower CPMs when running short campaigns with small budgets and refreshing ads weekly.