1: It's best to write blogs for yourself. Whether someone is interested or not is on them.
2: If you have problems with article size, keep them to about 3 paragraphs. One introduction, one elaboration, one conclusion. It makes your text seem dry, but it's a good start.
3: You'll only find problems with the article once you hit post, so you might as well hit it early. Worry about fixing problems later.
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.