Not honestly sure what you mean there, Nathan. There was indeed step-by-step what needs to happen there. I understand there may have been questions after that, but there were indeed specifically what needs to happen.
@CaptJeff, you are currently running PHP 7.4.
Before you continue any further, with the working site, have you made a complete backup of the files and database at this point in time? If not, please have your hosting company do this before you do anything else at all. And we can then work from there.
With regard 3rd party items, you have 4 3rd party plugins, although they are all disabled. If you are not using those, you are probably best to uninstall them completely, by visiting System>Site Features>Plugins and selecting the x next to each item. I would highly advise on not using any 3rd party items, and sticking with the base product.
Get to this point, and we can then continue from there