Traditionalists are ethnic rather than civic nationalists. We believe that a "people" becomes so through a shared ancestry, history, language and culture. Liberals are either civic nationalists or else internationalists. The civic nationalism that dominates most Western countries claims that anyone can become a citizen as long as they assent (at least during the citizenship process) to some liberal values. Civic nationalism usually involves mass immigration from around the world, as it permits anyone to claim national membership - there are no limits to who is eligible.
Lauren Rose is an American YouTuber. I don't know much about her politics, but she is articulate in explaining why she abandoned her belief in civic nationalism.
If you'd like to read more on this topic, there is a chapter of my e-book which goes into more detail here.