I travel frequently alone internationally
Rule of thumb, travel to countries that speak your language if you are not familiar with them. It just helps you navigate better. If it's a country that speaks other languages make sure that English is common tho in the areas you'll be staying
Also, if you travel alone, make sure it's a safe country, without any travel warnings
I'd also say that if you're on the lgbtq+ spectrum, to only travel to countries friendly to this.
May personal fav countries that I've traveled alone to-
- Turkey
- Morocco
- Spain
- France
I've traveled with friends to Peru, Argentina and Chile and they're def doable if you don't speak Spanish.