Adjust ad budget or schedule

I need to change the daily budgets and flighting for these campaigns today. For Downtown Coffee increase daily budget from $25 to $40 Monday–Friday 6am–11am only; for Yoga Studio reduce daily budget from $60 to $40 and pause weekends; for Landscaping keep $100 daily but move spending to 8am–6pm to match office hours. Make the changes in that order and confirm each campaign still has the correct ad sets and billing is unaffected.

Before I adjust budgets, make it easy for a nontechnical manager to approve. Show projected daily spend and projected leads per week for the new schedule, and show the expected change in CPAs. Highlight any campaign that will hit the account spending limit or risk delivery loss by pausing weekend traffic. Suggest one conservative and one aggressive schedule option with estimated impact.

I cut weekend budget on the Yoga Studio to save cost and within 48 hours leads fell by 60%. I cannot tell if those weekend leads were low-quality or if weekend traffic was feeding weekday conversions. I’m worried reducing spend will permanently lower volume. What is the most likely explanation and the best immediate test to decide whether to keep weekends cut or restore them?

I frequently reallocate small budgets across campaigns and then a week later we see unexpected volume loss or spikes in CPA. It wastes time and frustrates clients. Which budgeting habit am I getting wrong, and what repeatable rule should I use so budget changes are reversible and measurable without surprising results?