For anyone with a z620 HP, I could use some help

I currently have a High Sierra install on it courtesy of the great guide from Insanely Mac. If anyone has Mojave or Catalina on a second gen HP like this, how did you go about it? I am looking to do a fresh install and get mine as close to vanilla as possible. I may leave well enough alone for now but I am tempted to upgrade here soon.

submitted by /u/doc_brietz
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