What should I do if I want to become stronger in English?
I am busy with work and don’t have much time to improve, but I really envy p
eople who are good at English and can communicate with foreigners freely.
I really want to be such a person.

Have to make it part of your daily life, listeningand speaking. Try podcasts for listening during the week then make time for Discord or an online language exchange on weekends.

idk what u r talking about

the upstair seems a werido "It's n b of yours"like?

Incorporate English into your daily activities. practicing speaking and writing, learning in a small manageable chunks and use digital tools and apps. engage in lingual exchange, make use of commute timeand accept discomfort and keep practicing. Immerseurself have a English speaking culture

Obviously your case is a result of your life. Think about how much time the others spent with thelanguage. Since you admitted you don't have spare time to learn, how come you could envy the others like that. There's definitely no shortcut of learning a new language.