I have a simple solution for writer's block.
I used to be in the same situation as you.
I would write a paragraph.
And then, just as I'm beginning to start on the second one, an idea comes to me about the first paragraph.
In fact, the idea is so awesome that I ended up deleting the first paragraph and wasting a lot of time in the process.
As you can well imagine, doing things that way led me to basically chase my tail.
Every single article take way longer than I wanted.
The way I fix this was I dictate a lot of my content.
I can't do this for all niches but for the most part, I try to dictate everything I write.
I can't do this for all niches, though.
Still, when I dictate content, I'm less likely to write in circles or chase my tail.
Basically, I would go down my outline and once I'm done with one outline point, I move on to the next item and then the next item after that.
I don't suffer from this temptation to go back and "fix" things that I said earlier.
Once it's done, it's done.
And then once I get my transcript from my manual transcriber, I can then do a quick edit to tighten up or cut out certain parts of the final transcript.
Using this method, I am able to write 25,000 or more words per day.
No writer's block there.
In fact, this dictation blogging or dictablogging has really helped me become a better writer.
How? It freed up so much time that now, I read a lot more than I used to.
As you probably already know, to become a better writer, you have to be a good reader.
Don't just read stuff in areas that you're already an expert in.
Read stuff that is completely unrelated.
Because you're learning how to think clearly and make logical connections.
The more logical thinker you are, the better of a writer you will be.
So from one writer to another, I suggest that you stick to it and don't worry about writer's block.
There are ways to get out of it.
You can try dictablogging.
You can also try chopping up your work cycles into smaller bite-sized pieces.
Whatever you do, don't quit.