Customize Screen Blank

I was just about ready to launch my website, but after updating to the latest version of WordPress (5.9), I noticed that my customizer screen is now blank. I have tried troubleshooting through the WordPress Support Forum, and nothing has worked. I’ve tried deactivating all of my plugins, deactivating my theme (Hello Beaches-the Hello Shores) and activating the parent theme, Genesis. Doing this caused my site to function differently, remove widgets, add a header bar on the right side, etc. which I have tried to fix. I then tried deactivating the theme and activating a default theme. I also tried updating the PHP from 7.4 to 8.0 then 8.1 which caused my site to not function entirely. I switched it back to 7.4, and now I am back where I started, unfortunately. Everything else seems to function except for the customize screen. I am at a loss for what to do as I am very new to WordPress. I have linked the screen I see in the customize window here and as a screenshot: https://hayleysmountaintravelguide.com/wp-admin/customize.php?url=https%3A%2F%2Fhayleysmountaintravelguide.com%2F