What is problem for Abusing HTTP Misconfigurations hard Skill assements lab

I worked on this lab(Hard skill) and i did anything you think , parameter discovery with x8 and fuzz with ffuf but nothing i found many path but no one help me to find vulnerable parameter like xss or etc and i checked last posts about this but no helped to me

Hi, I just finished Skills Assessment Hard. I could not solve it by my self, someone helped me. So if you need help let me know.