… This may sound a bit pessimistic, but I think the main thing to look for is whether there are viable ways for one to enter said new country in the first place

Using the Low Countries as an example… For non-EU (or a select few countries) citizens, these three only grant residency permits to people who have a really good reason to be there… I believe they allow things such as having a job, having family, going to university, and some other situations. NL has the DAFT visa, but that’s only for American citizens (I believe?) and is quite difficult to follow-through

Depending on how young… maybe uni would be a good bet? NL has some extremely strong universities. I’m not familiar with the system there though, from what I just looked up looks like they’re quite expensive for non-EU citizens