Rumor has it that Facebook algorithms prioritize recently created ads over older ones, i.e. new ads tend to get more impressions. To test that hypothesis and at the same time get more exposure on your best performing ads you can use our duplication rules:
This would automatically create duplicates of ad sets that either have ROAS over 3 OR Cost Per Purchase less than $15.
Give it a try yourself and let me know if you need help setting up any rules.