I’ve realized that I haveneed to train my other English skills, rather than always focusing on listening. I’ve realized that I need to train my other English skills, rather than always focusing on listening.

"Have to" isn't wrong, but to my ear it sounds a bit like someone else is requiring you to do it. "Need to" is more about an action necessary to achieve your goals.

So I’ve decided that starting today, I will be writinge a bit more and studying more about punctuation and good grammar more. So I’ve decided that starting today, I will write a bit more and study punctuation and good grammar more.

A language has mostly fourfour basic abilities you need to train to be good at iproficient. A language has four basic abilities you need to train to be proficient.

Those skills are listening, speaking, writing and use of the language. Those skills are listening, speaking, writing and use of the language.

I always thought that the fourth skills was reading? But I didn't want to correct the content of your writing! :)