Being bilingual can improve your English
Although studying a foreign language is likely your main objective in order to gain new skills, being bilingual may also allow you to improve your spoken and written English skills.
Learning a foreign language's syntax, verb tenses, and verb forms may also make you think about these characteristics of your own language, which might help you become more proficient at grammar. Consider this: Do you truly comprehend the underlying grammatical rules of your mother tongue, or do you simply intuitively feel that way because you grew up with native speakers? Learning a new language also makes you a better listener as you are used to having to interpret meaning and judge nuances.