Avoid making these changes to Google Shopping Ads during the holiday season.
1. No last-minute changes - Any sudden increase or decrease in the budget just before the holiday event may be detrimental to the campaign's performance as Google's machine learning needs some time to adjust. Changes in the budget will send campaigns into the learning mode. It’s not advisable to make any last-minute changes to your campaign budgets.
2. New product updates - Adding new products to the feed or campaign just before the holiday event is not recommended as it may send the shopping campaign into learning mode. New products take time to adjust with Google's algorithm so if you want to introduce new products for the holiday season then you should add new products at least before 2-3 weeks.
3. Bidding Strategy Updates: Changes should also not be made in the campaign's bidding strategy before the holiday sale event, as this may also send the campaign into learning mode, which can result in a loss in ad traffic.