that's what I felt about moving to a different country, too, until I didn't.

I think these things are less consistent than is often stated, we just see them occur consistently among people with similar lives. The "mid life crisis" is also debunked and replaced by "existential crisis" since it can actually occur at any age, from teenager to elderly, and zero, one, or multiple times. Only in the classic life progression of a certain era, it typically occurred worst at around 40-45 so it got that label.