Ooof good question!
Had a really great French and Spanish teacher when I was a teenager who inspired me.
Had a holiday to SW France.
French girls.
Realising that learning other languages help you learn your own a little better.
Then studied it at uni but that it sucked my love for it.
Then worked at French companies in really small French villages as a young adult.
And my first grad job was selling ski holidays and hotels for a French company.
So I guess it’s mostly time in the country + liking the culture and way of life.
With Portuguese I’m less inspired by the language. Spanish less so. I’ve never stopped to really wonder why.