Saluton Teuku
Good question ! Yes please write also in your mother tongue or your favourite language. Steemit is a global thing and what better way to show that is there than using your mother tongue. I do think that English novadays is a kind of global language however ESPERANTO would serve much better for that. I am talking about language justice. English native speakers always will have an huge communication advantage, doesn't matter how hard you struggle.
As I am grown up in a communist country I learnt at school Russian, and because I was not keen in learning it I couln't get English lessons later on. Actually there also was no real need to do so (it was the time before computers...)
Only later on in life, when I could travel beyond the communist sphare I understood that I have to learn English. However only in South America I realized that English was not very helpful beyond the airport.... and I started learning Spanish, still musing about a global language. So what about Chinese, Arabic...?
I myself write on steemit in Esperanto too, firstly because it is genial and I do so to spread the word of course.

Steemit is a graet location. I never heard about your country before I came here. It looks so interesting.

Ĝis revido !