If you're not already, make sure to register with the embassy in Bern, they then invite you to national day events and some other things.
I am a "fake" luxemburgli so not a native speaker... but at least you can take comfort that there are many other languages in europe with less speakers. Take Romansh for example.
For the rest of you, please learn your first luxembourish word: Gromper!
(it actually means potato