I'm 50 and never studied abroad, just enjoying reading English books and learning new words everyday. Listening and speaking is important. Keep practicing them. And to improve your English to next levels, you need to read books written for native English speaking people. Here are my recommendation for learning English while reading books.

1. Buy an Onyx Book e paper reader. I want to recommend Leaf 3 or Go 6 which has just been released.

2. Download e books from Anna's archive, where all books are free of charge.

3. Download English dictionaries on https://downloads.freemdict.com/Recommend/Collections/ 

   i) If you are a beginner, download these 2. Oxford and Merriam-Webster, in which definitions and examples are made up of 3000 basic words.

4. Create folders under 'dicts' folder in above Boox device. A newly created folder can contain one dictionary file, ~.mdx file. The name of these new folders should be in Alphabet.

Now you can read free English books in a device which is good for long time reading and which is equipped with the free best English dictionaries. Even if you are old enough and don't need to prepare for English exams, keep learning and reading English books and in 10 years, you will become a different person from who you are now. 

Think of reading English books as traveling and exploring a new world you have not been aware of even its existence. Enjoying the world is important. What kind of world do you want to explore? In my case, my new world is full of deep philosophy, history, spirituality, psychology, medicine and music. Hope you can firstly find out the new world you want to explore.