Hello, Reza, and Welcome to Steemit.

Yes, better late than never, but Steemit is still in its early days, so you have a head start over most of the world. ☺

As a writer, you'll find the platform to be fantastic. It's essentially a blogging / publishing platform.

On top of that is has a pre-fab site, a ready and waiting audience, and a great tool to motivate writers such as you and I. That tool is the crypto-currency STEEM!

(I tried blogging before, and failed or just gave up. With Steemit, I've succeeded and continued ..... Hope you do, too.)

Below are a few basic points of advice re posting on Steemit.
1 – Longer posts are more lucrative than short posts. If you make a post of 20–30 paragraphs, it's more likely to earn rewards.
2 – Include some photos, images or graphs, to complement the text.
3 – Make sure the text and photos are formatted properly, so that your post looks attractive and appealing.
4 – Be yourself.
5 – Be interesting and informative.
6 – Create quality content. Steemit is intended to be a platform of quality content. (You will see many insignificant posts with meager content and no quality. Most of those of posts [called “shitposts” by Steemit whale Stellabelle] will earn few rewards and soon pass into oblivion.)
7 – Get online and start curating. Read various posts, comment on those posts you find interesting, and upvote those posts. That’s the best way to attract followers.

Hope this helps for now. Good luck, and Full Steem Ahead!