According to https://www.oxford-royale.co.uk/articles/reasons-learn-english.html

These are the best reasons to learn English:

1. English is one of the most widely spoken languages

2. English will open up more opportunities for you

3. English will make you more desirable to employers

4. English gives you access to some of the world’s best universities

5. English is the language of some of the world’s greatest literature

6. English allows you to get more from popular culture

7. English allows you to attend international conferences and events

8. English has a simple alphabet and everyone’s equal

9. English gives you wider access to knowledge

10. English is a fantastic intellectual challenge!