Don't put a campaign spending limit on a winner. The cap pauses the ad while it is still buying.
Most accounts I audit add a campaign spending limit so Meta cannot overspend. The winner hits the cap at 2pm. Delivery dies. Learning never settles. Tomorrow it spends again until the same wall. They call it protecting budget. It is a daily kill that has nothing to do with CPA. A limit is not a kill rule. It is a scheduled pause on an ad that was working.
Do this:
Winners stay on a daily budget with no campaign spending limit. Do not cap the campaign so it turns off mid-day.
If you need less spend, lower the daily budget. Do not add a limit that pauses a live buyer.
Kill on cost per purchase after a real sample. Hitting a dollar cap is not proof the ad failed.
If a campaign spending limit is already on, duplicate the winner with the limit off. Leave the original alone until you have a real sample, then keep the version that still buys.
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