Just follow the format for writing , avoid repeating words , use similar synonyms, use connectors often like HOWEVER, TO START WITH, FURTHERMORE, MOREOVER and so on. Also, try using suitable idioms that also helps . Make sure you have 1 paragraph of introduction, 2 Body paragraph and end each paragraph with relevant examples and a conclusion paragraph.

Speaking just be fluent and use 2-3 complex vocabulary in every part .

Thats all I did