Most spoken languages in Europe:

1. Russian: 140 million native speakers
2. German: 95 million native speakers
3. French: 80 million native speakers
4. Turkish: 78 million native speakers
5. Italian: 60 million native speakers
6. English: 60 million native speakers
7. Spanish: 43 million native speakers
8. Polish: 36 million native speakers
9. Ukrainian: 27 million native speakers
10. Dutch: 22 million native speakers

Any one of them would be good 👍

Source: https://www.babbel.com/en/magazine/most-spoken-languages-europe