I also learned from TV, mainly Friends, Scrubs, Family Guy, and similar, with and without subtitles. Then had a gf/wife for twelve years who was native English speaking from across the pond.

I'm good with math and music, and such people tend to also pick up languages easily, or so I've understood. I would say I speak and write at a native level though thanks to being with that woman for so many years and communicating with her in English, and doing daily communication online in English for decades now.

Also having a curiosity where I look up words I don't know, or when I see new words. And I'm interested in a lot of fields where there's a lot of advanced lingo which also helps. People I listen to are well spoken and good with words, which inspires me.

So I guess all these things combined made me quite proficient. 🤷‍♂️