My issue doesn’t necessarily revolve around “fixing” wordpress itself, because it’s doing its services perfectly.
This issue is just me being stupid and I didn’t know where this question was suitable to place outside of the most face-value title of trying to fix my mistake

How do I reset my wordpress site back to a clean slate?

Me and my son have been working on a site together and I installed and made a bunch of changes in development thinking I knew what I was doing.

Well, long story-short the website is spaghetti and It’s got to a point where trying to retrace the steps has become more difficult than trying to work past it, I need to figure out how to just reset or re-install the build and wipe away all the data in the sit so it could just be a clean slate again–a factory reset, if you will.

My issue In trying to figure out how to do this without having to buy a whole ‘nother domain or resetting the entire site process from scratch (propogating, purchasing SSLs, cpanel, etc)

Does anyone know how to do this?
TLDR; How do I reset and/or clear all of the wordpress site data back to a clean slate? (post WP installation)

The page I need help with: [log in to see the link]