I'm very envious, because I speak English only as foreign language (my mother tonguenis Hungarian as I mentioned earlier). And you are right, the frequent use - and the environment with native speakers - are the key (unfortunately it was decades ago when I was in native environment for weeks). I was tautht to French is high school (completely forgotten), and Russian for many many years (it was mandatory "thanks" to we are in the Eastern - communist - Block). I forgot this language too (sometimes I can catch some words). And I learled Hebrew and Zulu in autodidact manner, but it was a "kiss for a dead".

Some people, like you has special talent to easily learn languages. E.g. my daughter's mind is like a sponge, it sucks any language in very short time and she can actively use them, from English to Korean.

I think it the "sensibility" for languages depends on some special layout and wiring in brain.

So you are very lucky, cos you can move and get any job, and/or living quasi anywhere in the world.

And yes, I know Hungarian is a world language, but the world doesn't know about this fact 😁