Performance Max campaigns fail because they're launched too early, before search and shopping campaigns have built enough conversion data. Treat it as a secondary campaign only, not your foundation. If it's not working, pause it and strengthen search and shopping first.
Chapters
When it comes to different types of campaigns in Google Ads, Performance Max can get a really bad rap. The reason for why it gets a bad rap is because people are using it in the wrong way. What you need to remember with Performance Max is that I really see this as a secondary campaign. So what I mean by that is that I don't start a new account with a Performance Max campaign. The reason for that is you need to always remember Performance Max was built and created by Google in order to generate more conversions. So that's why it's a secondary campaign. You don't start Performance Max until you are already have already got high performing search or if you're an ecommerce brand search and shopping campaigns. You need to have that high level conversion data before you even think about launching a Performance Max campaign. So if you're not seeing success with performance Max maybe pause it, make sure go back and focus on your search and shopping campaigns and then you can build out to Performance Max.