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You might be a proactive PPC manager but there could be elements of the account that may hurt your PPC performance.

When an account is performing well, then you should be most vigilant in searching for “Hidden killers”;
Killer 1: Incorrect Campaign Settings
When you launch numerous campaigns or if you keep adding campaigns frequently, campaign settings may get missed. It doesn’t mean that the campaign is broken but it may not be reaching to its full potential.
Pro actively, you should ensure that the settings have all the correct information related to your campaign’s goals like, bidding, budget, Ad targeting, location targeting etc..
Do a quick review of all your campaigns, If no errors then great! However, if you find even single setting that is incorrect then you can surely make great progress with few clicks :-)
Killer 2: Neglected Ad text split tests
If you are testing your PPC ad texts on regular basis then only you can have good click-through rate.
If your account is really performing well, then it is a good time to run an ad text report to check if there are any ads active which are under performing.
One should make sure that each Ad group has valid sample size in order to check the performance.
Killer 3: Poor Performing keywords that are hidden in Good Ad Groups
There are certain Keywords that hide in the better performing Ad group. Even though, your AD group is performing good then also there are certain keywords present that are generating traffic but few conversions.
Therefore, you must run a keyword report to delete such terms.
Killer 4: Irrelevant Search Queries
While using broad match or phrase there are certain Keywords/ phrases that are not at all relevant to your business, therefore, you should run a search query performance report in order to build your negative keyword list.
Killer 5: Poor converting sites on Content Network
Similar to poor performing keywords, your campaign is doing good in the content network but still there are a few sites that are not generating conversion/ potential clicks, therefore, these sites must be excluded from your list.
Always Remember “ If your account is doing Good – It can always do better!”