A single Google Sheets document can hold a maximum of 2 million cells. Your connections will fail to run if you are close to this limit. You can check the current number of cells used in a spreadsheet by sending your feedback.
To prevent connections and updates from failing, please ensure that your spreadsheets are not close to the 2 million cells limit.
To reduce the amount of cells used inside a spreadsheet, remove any cells, ranges, columns, and sheets that you no longer need (obsolete) or that don't contain any data (blank).
Tip: Use a filter or query to only transfer the data that you need.