Look at what competitors are doing
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[https://www.facebook.com/ads/library/?active_status=all&ad_type=all&country=GB&impression_search_field=has_impressions_last_90_days&view_all_page_id=1580941948681006&sort_data[direction]=desc&sort_data[mode]=relevancy_monthly_grouped](https://www.facebook.com/ads/library/?active_status=all&ad_type=all&country=GB&impression_search_field=has_impressions_last_90_days&view_all_page_id=1580941948681006&sort_data%5Bdirection%5D=desc&sort_data%5Bmode%5D=relevancy_monthly_grouped)