1. Check Ad Review Status: Make sure your ads and ad groups have passed Google’s review. Sometimes ads don’t get displayed because they don’t meet policy requirements.
2. Increase Bidding: If you're using manual bidding, try raising your bid to ensure your ads have enough budget to compete for impressions.
3. Adjust Target Audience: Make sure your target audience is large enough. If the audience is too narrow, it may limit the ad's visibility.
4. Increase Ad Budget: Raise your ad budget to increase the chances of your ads being shown. A low budget may prevent your ads from showing or showing enough.
5. Optimize Ad Quality: Ensure your ad copy, images, and landing pages are well-optimized and meet Google’s quality standards. Low-quality ads can affect their display.
6. Check Payment Information: Ensure that your payment method and billing information are valid, as issues with these may block your ads from running.