I want to obtain the ability to explain something in English!

I want to ask you about studying foreign languages!
How do you do say when you want to bring your expression skills up?
Please tell me what you mainly do.
I suffer from a dearth in that skill.

In my next note, I'll try to explain something in English like English-English dictionary!(´ｪ｀)b
Please help me to correct my note!
Thank you for reading~!

The word "wanna" is an acceptable slang term for "want to" in English grammar. I corrected it because I wanted to show you the proper grammar, in case you did not know.

I wanna obtain ability which I can explain something in English!

I wanna ask you about studying foreign languages!
How do you do it when you wanna bring your expression (skill/level) up?
Please tell me what you mainly do.
I suffer from a dearth of in that skill.

From my next note, I'll try to explain something in English like an English-English dictionary!(´ｪ｀)b
Please help me to correct my note!
Thank you for reading~!

I would definitely practice using them in your conversations. Another recommendation is when you are listening to English tv shows, movies, or radio, shadow what they are saying (like your shadow follows you around). That way, you can learn how expressions are used in everyday conversations.