Because of Covid regulations? I've not seen anything in the news about Greece recently (though its not a country I keep an eye on)?
I'm feeling more positive now that I
may get to see my sister sometime this year: it looks like the first hurdle will fall soon because the UK government is going to finally recognise EU & US vaccine records. Which means UK residents who've been vaccinated abroad will also be able to travel home to see family without having to quarantine. There's still a second hurdle though.....we also need the US needs to open its borders to non-citizens because she can't come home to visit unless she can be sure that she'll be allowed back in again