I still to afraid to go on holliday due to the Covid-19 outbreak. Originally we made plans to go to Greece for 2 weeks, but I do not know what to do.
Shall I stay home and cancel my trip?
You should not cancel your trip.
Even if you stay at your country you might get infected.
It is the same thing - and as governments decided to open boarders and let tourism activity be active then you are free to go to your trip to Greece or wherever you want.