Just to be clear, there is little to no risk of someone running a simple blog getting fined by a data protection regulator.
In the UK for example the ICO who regulate data protection matters concluded 17,300 cases, in which only 16 of them resulted in fines.
I’m just intrigued as to how you have developed this perception of GDPR and data protection law looking to regulate small one man blogs out of existence?
/edit oh and my other point still remains - even if you’ve got some customers through a blog, you don’t appear to be within scope of GDPR on the assumption you’re not directly looking to do business with EU based customers (for example through offering payment options in European currencies).