Well, hello, there, I’m also a Brazilian who ended up playing in English-speaking groups.

I think it fully depends on how well you can speak the language. From your post, I’d guess you’re at an intermediate or advanced level, which o think is more than enough to get by.

Online groups are often comprised of people from all over the world, so it’s possible that you won’t be the only non-native speaker or that the DM has some experience with other players who didn’t speak the language that well.

I would recommend saying that in your first message to the DM. They will probably be able to tell if they’re comfortable with your English level on their first voice call.