"Your writings need not be perfect"

But to this I would add:

Proofread. Nobody likes to read something full of typos.

Learn to format properly. Presentation counts.

Make it interesting. Ask yourself "Would I enjoy reading this?" (Why should some random stranger care about whatever you had to say? If you can't come up with a convincing answer, think again before pushing that "Post" button.)

Use decent grammar. Sharpen your language and composition skills. If what you've written is full of mistakes and doesn't make much sense to a native-language reader, it's not going to get you positive attention.

Do a little research if appropriate. You may not know everything about your topic, but you have the internet. Use it. Don't include errors in your information. Double-check your "facts." People need to be able to trust what you say. (Never, ever, ever steal someone else's work, however, and pass it off as your own.)

Don't post crap -- just because it's easy and you don't feel like making much effort. There's way too much crap on Steemit already. You don't even have to read a lot of posts every day (like I do) to know that from personal experience.