How to lock the font on one page so it never changes

Site URL: https://www.poeticallygrey.com/truckstoppancakes

I am trying to figure out how to lock the font on this page so it doesn't change when I change the font on the rest of the website.

Hi,

Yes, that's possible.
You'd just need a little bit CSS coding for that
(DESIGN > CUSTOM CSS)

 For instance
 

#block-f826ed063469d27ebb98 p
{font-family: Arial !important}

applies a certain font ONLY to this specific block (see the screenshot > green)