GGB Invert the daypart plan rather than fighting it: daytime trade compresses while iftar concentrates an entire evening of demand into one sunset seating, with suhoor as the late-night lane. Rebuild the roster around prep-by-day and service-by-night, shift purchasing toward the iftar menu, and put booking and set-menu discipline in place so the compressed seating actually converts. Confirm the current local rules on daytime trading in your market, as they vary and change.
From Ramadan and the Seasonality Map: Revenue Planning for GCC Restaurants — the full reading, with the method behind this answer.