It sounds like your campaign is suffering from ad fatigue and audience saturation. Even with broad targeting, if your creative hasn’t changed, Meta starts showing your ads to the same users repeatedly — which can tank performance over time.
To recover:
Refresh your creatives (new visuals, headlines, and offers).
Duplicate your top ad set with updated content to re-enter the learning phase.
Add light targeting filters (like age, gender, or region) or test a lookalike audience from past buyers.
Launch a retargeting ad for users who engaged but didn’t convert.
Double-check your pixel setup and ensure all conversion tracking is working properly.
Even great ads need refreshing every few weeks. Rotate creative regularly to maintain momentum.