Performance max campaigns are designed to run across all Google channels at once, which includes search, YouTube, Gmail, and display. They use automation to find the best placements for your ads. However, they do not give you the same level of control that traditional search campaigns offer. With search campaigns, you can control exactly which keywords trigger your ads and what your bids look like. Performance max is good for scale, but it should work alongside search campaigns rather than replace them. Have you tried running both at the same time?