How to expand your vocabulary?

The wall you hit once you can speak a little English.
The "Oh, I'm using this same word/phrase every time" problem.
For example, when asked "How are you?", you only say "I am fine" or "I am good."
Or, when writing a thank-you note, you end up with a letter covered in "thank you" because you keep using it over and over.

A vocabulary recycling center. You are reusing the same words over and over again!

Wait, don't you find that strange? Native children don't recycle words like that, do they? Why? They learn from their parents, but it's the same as in Japanese. In Japanese, we have language arts classes where we learn about writing essays and synonyms, right?
Schools in English-speaking countries also teach synonyms in class, and teachers guide students in writing classes to avoid using the same words as much as possible, which is how they learn.
What is truly useful at that time is a Thesaurus.
It contains many synonyms. Especially during elementary school,

It is my top recommendation! We bought the pocket edition and take it to class.

Leave being ECO to the environment, and let's go ahead and waste words as much as we want!!