Can’t Edit Site at all

Hello, Below is a video of me showing the problem. Some time ago I was able to customize the elements of the Home page by accident. Once I left it and came back, I couldn't anymore. I would go to the Home Page, press Edit, and it'll bring me to a Blank Page. I would even go to appearance, click customize, and it'll bring me to a blank page that I was editing with one background and was apparently saved. I'm new to this Wordpress and I'm not sure what's going on, please help: https://drive.google.com/file/d/1nerPeIJUle9xAy7or8wEC_azaGB2w4YT/view?usp=drive_link