Final Cut Pro X backup library missing all files

Hi all. I was having an issue with Final Cut Pro not exporting for an unknown reason. I followed online instructions to delete preferences which ended up hiding my library. I restored a recent backup I had from a few hours ago and everything seems to be in place except for the fact that all the files were missing. I relinked many of them but some are still missing. I had many imported from my iPhone that I figured were just saved in Final Cut Pro (I'm not an expert with FCP, clearly). But all the files imported from my iPhone, many compound clips I had made in various projects, and a handful of others are all missing with no way for me to recover them. I still have the videos on my iPhone but I cannot re-import them for an unknown reason.

I've been finding zero answers for hours and I'm completely stressed and done. Any help you could offer would be wonderful. I just need to find a way to restore the rest of the files that Final Cut Pro had in the library.