This is an excellent post!

Thank you!

but sometimes it is difficult to figure out how to make it more than just 2-3 sentences

There are two possible reasons I can think of for that:

• you don't know enough about the topic; maybe more research can help, but if you are - let's say - an artist, trying to write a technical post may not be a great idea, unless you feel comfortable with both fields
• you don't have enough writing experience, and that will come in time, as will your content flow

It is also possible to just have a bad day... We all do, and better men and women than us do.