litespeed did not speed up website

Hi, I used elementor to make my website and wanted to speed it up with litespeed. But after implementing the advanced setup I noticed some parts of my website weren't working properly anymore. So I checked what happened and it turned out css combined was causing troubles which I couldn't fix. So I had to turn off guest optimisation which also slowed down the website a lot and made the phone website even worse. Not sure what to do now.