An I idea could be to carry a writing pad or small notepad to keep handy when you'd like to write an unfamiliar word. Writing skills will build up with consistency and a way you can do this is with practice, practice, and more practice.

Perhaps you can take a moment to re-write a paragraph or an article.

You can start with small words and write them over and over.

Answer an online survey - questionnaires are available online that you can write the answers to each question.

A few ideas to help give some influence, hope this helps. :) 

30 days challenge - your country's location.

What makes Taiwan so special?
During that time transportation was not convenient.
So they needed a checkpoint to help *support* or *with* airplane refueling.
Not only transportation but also communication is was not easy at that time.

Taiwan is an island *where you can find a variety of* around fish like tuna and mullet.
We have a fishing port except for the east of Taiwan. - *are you saying there is a single fish port on to the east or many fishing ports in Taiwan, with the exception of to the east, where there are not any fishing ports*?

The southern *part* of Taiwan has a coral reef, and it's a very beautiful, protected as a national park.
The structure of Taiwan is different both east side to west side.
The western of Taiwan is sandy shore, *and* the east side is rocky shore. - maybe change the word from rocky to rough.
That's why the shape of Taiwan looks like a sweet potato.

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please let me know if there's anything wrong. thank you.

Hope these corrections help a bit. Very informative. :)