I had two clients from America I want offer graphics designing jobs for, I demanded my payment would be in Bitcoin
BTC or Ethereum. To my greatest dismay, they were dumfounded on what Bitcoin or Ethereum is. I am still suprised up to this very moment.

You are surprised that they don't know what Bitcoin is? And do you think it every there that deals with the internet , work or get updates on currencies. Haven't you seen people who work nature or schedule do not even permit to know what going on around. Some might have even heard about Bitcoin but not pay attention to it. While some already concluded it's for internet fraud stars so they have nothing to do with it.
There still many people out there who don't know about bitcoin or ethereum or another coin because they still use fiat money to transact and they use fiat to buy they want.
Maybe we still need to introduce crypto among them so they can know that now, another payment option is available and they can try to use crypto as the payment or for the investment.
That will be different if that person has a big curiosity about the new thing. They will search for more info about that, and sometimes, they will spend their time exploring how to get involved in that thing.