Clearing Lightroom

Honestly, there are many ways to organize, and Scott Kelby, in my opinion, doesn't really present great choices and does present a poor choice.

Instead of organizing folders, another choice is to organize within Lightroom Classic, using Lightroom Classic tools such as keywords and other metadata. Then, it doesn't matter what the folder structure is, because you do all your searching via keywords and other metadata. This has a major advantage over folder organization, because most photo libraries (maybe even yours) don't fit nicely into a folder organizatoin scheme, as photos can be in only one folder, but might logically belong organized into several categories (think of a family vacation to the beach, the photos need to be organized into "Vacation" and "Beach" and by people in the photo, and by geography) all of which is easy to do with keywords and other metadata, but nearly impossible with folders.

The only thing I use folders for is storage locations. I import photos into folders named by capture date. All other organization is done inside Lightroom Classic using keywords and other metadata.

Before you clear all and start again take a look here:

How do I rearrange existing photos into a new dated folder structure? | The Lightroom Queen

If this doesn't help I wouldn't clear all images from an existing catalog. I would start with an new catalog. So you can at every time you like go back.

Be aware: I you'll start again with an new catalog or clear all images from the existing catalog you'll loose all your editings that you've done.