For GDPR to apply, your website needs some connection to an EU country beyond just being on the internet. What constitutes such a connection isn't an exact science, obviously, which leads and/or allows people to make rather strange claims, the worst of which is probably that such ambiguity makes it entirely impossible to make laws on the subject.
The "official example" is explicitly making accommodations to sell to customers in the EU. The marginal example on the non-GDPR side of the dividing line is a US website, in English, that does sell to EU customers, but only if they sneak their country into the generic second line of the address form.
What gets you to the other side of the line is, for example, a drop-down that lets you chose an EU country for delivery, a switch that allows users to chose to read your website in German (but not Portuguese b/c Brasil), etc.
While there are plenty of cases, as always in life, that straddle the border, one thing is and always was clear: your English-language blog does not fall under GDPR.