If this is a service business, check the phone before the schedule. The Google Ads calls report lists every ad call with its length and whether it was answered.
On one local account I run, clicks were steady but 55 of 58 ad calls in a month went unanswered, so the conversion count moved with who was at the desk, not with search demand. Weekends are where that bites hardest. If your weekend calls are ringing out, the fix is coverage, or an ad schedule that matches the hours someone picks up. No bid change will show you that.