[OC] Die Globalisierung des europäischen Fußballs – Anteil ausländischer Spieler in den Top-5-Ligen Europas, 1996–2024

Well done. I spent minimal time on „WTF am I looking at“ and could jump straight to insights, because the exhibit is laid out cleanly, and is well-documented.

I know what the data is, where it came from, and what the trends are.
I like that you smoothed the curves but kept the original data in; the trends are what matter, but you „honored the data“ by keeping the year-to-year noise in- without distracting too much.
The title summarizes the chart.
Callouts aid interpretation and understanding.

The two callout lines don’t really point at the relevant curves; that’s my only nitpick.

If you want to convert data into insight, this is how it’s done, folks.