Gray ads are still likely to be rejected by Facebook
You should prepare 1 old profile from before 2019, 1 advertising account with appropriate spending history, 1 old page from 2022 that does not have or already has a customer file following the page depending on your needs.
Prepare 3-5 creative and content to test and select the most optimal ads and scale gradually
For more details, you can read more articles on BHW's Facebook forum