Find a new persona to sell to (weekly)
Spot a persona you aren't targeting and make ads for every funnel stage.
Look at the last 30 days of customer reviews and post-purchase surveys. Is anyone describing themselves as part of a persona we're not already targeting? Pick the most promising one and make 9 ads for them: 3 TOF, 3 MOF and 3 BOF. Showcase your product. If you can't find reviews or surveys, use your best judgment and search the web.