Je suis brésilien, alors portugais est ma langue maternelle. Je te suggère d'apprendre le portugais plus tard. Portugais est très similaire à l'espagnol. Je veux apprendre le français pour me souvenir des difficultés rencontrées lors de l'apprentissage d'une langue étrangère.

That's so true. You gotta keep practicing after finishing your studies, otherwise you'll eventually forget most of the things you learned. It's not like learning how to ride a bycicle. That's why I intend to follow some French youtube channels and watch them in a regular basis, and also interect with the comment section

I had no idea Luxembourghish didn't get fully standardized until recently. Kinda nuts to think of a native speaker learning their own language because of that

Aside occasionally trying to learn bit of Japanese, I haven't learned languages since school when I had Swedish, bit of German and a small introductory course of French (aside English), but those have gotten very rusty by now.

Nah I suck at language. I only know my own language, which is Dutch, and English, which I only know because every foreign game, movie and tv-series was in English when I was a child. Nowadays that isn’t necessarily true anymore and it shows, but anyway. I suppose though I can decently read and understand German as well. Better than Frisian at least, even though it’s the second language in my country, it’s like Chinese to me.

It would be nice though to know some languages a little better, but because it has never been my strong suit I don’t have the motivation now.

Finnish.

A result of this very late standardisation is that despite the country being very small, we still have several regional dialects: Staater (Spoken in Luxembourg city and the standard on which the written form is based upon), Minetter (South of the country), Miseler (Along the Moselle river), Eeslécker (In the north of the country), Islécker (Similar to Eeslécker, in the northeast of the country), Lakerschmus (A variant of Yenish spoken in a suburb of Luxembourg city), Aareler (In the now Belgian city of Arlon and due to this almost extinct now), and I'm sure I forgot some more...

Also I never ever learned Luxembourgish at school apart a bit of Lakerschmus, only German, French and English, in that order.

This is probably the story of most Finns. Finland has two official languages, Finnish and Swedish, and everyone has to study the other official language as well. Most of Finland is, unsurprisingly, exclusively Finnish-speaking in practice, so for most Finns, the 'other language' is Swedish. I think currently everyone has to study it for at least four years and probably even years more in practice, and most people probably mostly forget it soon after studies because they don't need it. I know I did. It's definitely much easier to learn it again than learning it from scratch, but even studying for longer than the four years you mentioned isn't enough if you're not actually using the language.