I wish I could speak Finnish. But, actually, there are tons of languages I wish I could speak. All of them, really, but Finnish is the first one I thought of just now.
I’m in the US and English is my my primary language. I studied Russian but have forgotten a lot of it. I know a few words of German and French, but very few.
Edited to add: Please tell me what your primary language is. It would also be interesting to know what other languages you speak, if any, and where you currently live.
As an American, I’d begin with Spanish considering how many others speak it.
Then Norwegian. Language of my ancestors and living extended family. Although all my relatives speak English just fine.