A few issues you may have:
1. Missconfiguration in you settings, like:
- have disply campaigns, but no images added;
- if you are into ecomm and connected your merchant account, if your products are limited there, no ads will run;
- you included restricted keywords in your headlines and description - keep that only as seach terms;
- check your campaign and ads for any limitations and try to fix them.
2. Website UI and UX:
- the speed of your site is lower then 12sec;
- you have scripts that break things or viewport images setup wrong;
- very bad user experience design;
- SSL missconfiguration;
- blocked/ restricted domain or server IP - sometime it may happed to get a domain that was own before and dumped, check if with WHOIS services and wayback machine;
- promoting services or products that are restricted;
3. Other isuess:
- bad tracking configuration in google - check the lighthouse and see if you have the google consent V2 setup or other errors;
- multiple installations of the tag manager, analytics or just simple missconfiguration between it;
Hope this will help you understand you ads account a bit better.