I can't reset my Mac to factory settings

I have tried the instructions at https://support.apple.com/en-us/HT201065 to reset my Mac to factory settings. Nothing happens. I have repeated the steps several times. Still nothing happens. How do I get tech support assistance?

If you are going to sell it / trade it in follow:

https://support.apple.com/en-us/HT201065

if you are just going to reuse it… follow step 8…

https://getsupport.apple.com/