According to Google: This error Indicates that user has exceeded the daily quota (either per project or per view (profile)).
You would see “(403) Daily Limit Exceeded” error response when Analytify tries to fetch the data from Google analytics and it hits the daily limit quota. Google analytics has limits on their data per day and per website profile. Remember, we are using our own default API keys.
We highly recommend to use your own API keys. So, you don't run into these quota exceeded errors. We have a detailed guide written for creating Google console project and generate API keys which you can use in plugin Analytify->settings page at advanced tab. Simply tick the checkbox and add your details.
If you are still unable to create API keys. We have a paid service to setup API keys for you.