Tip - Look into day parting

Analyze your account performance report by hour of day and each day of the week to find out the particular times of the day and week when there was a lower bid rate for the campaign you're running. 

Run a report to see account performance by hour of day and day of week – there might be times of the day where you can lower bids for certain campaigns, or pause some account elements altogether that may have historically spent without converting or historically converted with very high CPLs.