Hi Peter, thank you for this AMA.
I've been a green card holder for 1 year as the result of working for big tech in the US, originally via getting a L1-B 3.5 years ago. I'm planning on moving back to my home country in Europe permanently. Is there any way I can keep my green card or at least keep it for longer in case I start a startup in Europe and want to also have a US presence? I'm a Portuguese citizen.