I live in Denmark. I've met a few people who don't speak any English but they're not Danish :D
Also it's a fun language learning trope here that it's hard to practice because people will just reply in English if your pronunciation isn't good/it's obvious you're not Danish. It's not ubiquitous but it definitely exists sometimes
I went scuba diving in Belize. Tiny nation just south of Mexico. Former British colony, so everyone speaks English. Very nice climate. They have some of the best diving in the world, because they are next to a huge coral system. There are Mayan ruins and some interesting caves.
Essentially, get a list of commonwealth nations from Wikipedia and select what sort of thing you want to experience.
India for example also has all the climates and almost everyone speaks English. And they have more cultural backgrounds than the US, while being more affordable to visit. And everything is packed closer together but still plenty large enough to never see it all.
Or the Bahamas is great when it’s not hurricane season.
It depends what you want to see from the US. The US is massive and there is a huge difference in visiting NYC vs visiting Omaha.
It also depends where you are. For example if you're in the EU then visiting places like Paris or Amsterdam are probably out as they are accessible as a day trip.
If you’re looking for an alternative to the USA’s big landscapes and natural parks then Canada is your best bet. If you’re looking for more cultural stuff and things to do in cities then Canada only has a few nice cities and they’re spread across the country from coast to coast.
I’ve been to Toronto many times and talked to loads of people who have either lived there or visited there many times. You’re the first person I’ve ever heard say that!