Studying textbooks is important but you will never feel fully comfortable until you start having real conversations with fluent speakers in an informal setting. Many active members of our diaspora organize weekly meetups at local cafes where people can chat drink coffee and overcome their language barrier without any academic stress. I highly suggest you check the community announcements on the front page of
https://tbilistings.com/ to find the nearest speaking group schedule. Joining these meetings is a fantastic way to build your vocabulary and make some wonderful friends who are also navigating the adaptation process.