The Baltic’s and south east Asia.
I’ve lived in Egypt, Italy and went to school in England for a bit.
People in Italy generally only speak Italian if you are traveling by yourself you run the risk of standing out and people will take advantage of you. I’d say Greece is very similar while most people are friendly there is a large minority that will try and take advantage of you.
Great Britain is great for solo travel but i would recommend not staying in the larger cities.
I’d also recommend South Korea. Fun people safe and lots to see.
But the Baltic’s are awesome people are super friendly besides Latvia I found the majority of people I encountered and where friendly. Seriously one of the spots where people where inviting and willing to have a good time with a total stranger and be sincere about it. It’s also cheaper compared to Western Europe. Only times I felt unsafe is when their where drunk Russians starting shit or gypsies but they are easy to spot.
Edit: I solo traveled to guadalarja Mexico years ago did so much shit I am surprised I wasn’t kidnapped. I don’t know if I would recommend it these days though