For Japanese to improve their English level
The main problem of Japanese speakers’ English level is that most of Japanese read English using Katagana. You can say Japanese English is Katagana-English.
The problem of the main problem is that when Japanese study English, the teacher normally only teach them grammar.
For mastering a foreign language, the first and the basic thing is to master the pronunciation.
For Japanese, if you want to improve your English level, you can try the following thing.
1, Start from zero, ie. start from the pronunciation of the 26 alphabets.
2. Do not use any Katagana to mark any English words to help you to remember English vocabulary.
3. Speak it out
4, repeat 1, 2, and 3.
<pronunciation of 26 alphabets>