Google has begun canceling or deactivating accounts that have been inactive for a while. Google will email a notification if they do so.

If your Google Ads Account cancelled?  No worries this 60 second video shows how to instantly reactivate your Google Ads (formerly Google Adwords) Account, then breath easy.

Here is the transcription of the video:

So if your Google Ads campaign has not been active for up to 15 months now Google may cancel your account, or
actually render it inactive.

So you will receive an email such as this. Not to panic, simply go into your login to your Google Ads (account and) you’ll see a message up at
the top such as this, when your account isn’t active.

Click on the Reactivate Button it’s going to take you to Account Settings, you see this here Reactivate this account you will then be able to access your account, simple as that!